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  • Question 1 - In scientific experimentation, what is the term used to describe the movement of...

    Correct

    • In scientific experimentation, what is the term used to describe the movement of charged particles or solutes in a liquid medium due to an electric field?

      Your Answer: Electrophoresis

      Explanation:

      Electrophoresis: Separating Molecules Based on Charge and Mass

      Electrophoresis is a technique that separates solutes, molecules, or nucleic acids based on their mass and charge. It involves the migration of charged particles in a liquid medium under the influence of an electric field. The apparatus consists of two electrodes placed at either end of a support medium, or gel, which is suspended in a buffer solution. The sample is inserted into a well and a current is applied. Over time, positively charged solutes move towards the negative electrode, while negatively charged substances move towards the positive electrode. Once the migration is complete, the gel is removed and stained to color the substance being tested for, such as protein.

      This technique is widely used in medical testing, but it requires a higher degree of operational and interpretive skill than many other tests, which is why it often takes longer to get a result. Electrophoresis has various uses and adaptations, such as standard electrophoresis for protein detection in the diagnosis of myeloma, identification of unusual lipid fractions in patients with inherited diseases, and detection of viral DNA through Southern Blotting. There is also Northern blotting, primarily a research technique at present, which uses electrophoresis to separate RNA. Additionally, Western blotting is used to test for the presence of antibodies to DNA through protein separation.

    • This question is part of the following fields:

      • Basic Sciences
      13.9
      Seconds
  • Question 2 - As part of your general practice placement, you have been tasked with conducting...

    Incorrect

    • As part of your general practice placement, you have been tasked with conducting an audit on the duration of solid food introduction in the practice population. You review the data for the last six infants born within the practice:
      6 months, 7 months, 8 months, 9 months, 10 months, 11 months.

      What is the variance value for the duration of solid food introduction in the practice population?

      Your Answer: 17.6

      Correct Answer: 74.9

      Explanation:

      Variance and Standard Deviation in Breast Feeding Duration

      Variance is a statistical measure that indicates how spread out a set of data is. In the case of breast feeding duration, variance can help us understand how much the duration varies from the mean. The formula for variance involves squaring the difference between each data point and the mean, then dividing the sum by n-1, where n is the total number of data points. In a sample population, n-1 is a better estimate of variance than n because it accounts for the variability within the sample.

      For example, if the variance of breast feeding duration is 74.9 months, this indicates that the duration is widely distributed from the mean of 17.6 months. A smaller variance, such as 4.5 months, would indicate that the duration varies less and is closer to the mean. The standard deviation, which is the square root of the variance, is also important in the spread of data. In a normal distribution, 95% of observations will fall within two standard deviations of the mean.

      In the case of breast feeding duration, the mean is 17.6 months, indicating that babies are breast fed for an average of 15 and a half months. The median, which is the middle number in the data set, is 15 months, meaning that half of the babies were breast fed for 15 months. variance and standard deviation can help us better understand the distribution of breast feeding duration and other medical measurements.

    • This question is part of the following fields:

      • Basic Sciences
      36.6
      Seconds
  • Question 3 - What occurs in eukaryotic prophase? ...

    Correct

    • What occurs in eukaryotic prophase?

      Your Answer: Chromatin condenses into chromosomes

      Explanation:

      The Stages of Prophase in Eukaryotic Mitosis

      Prophase is the first stage of eukaryotic mitosis, except for plant cells which have a preprophase stage. During prophase, the cell’s chromatin, which is made up of DNA and associated proteins, condenses into double rod-shaped structures called chromosomes. This process is facilitated by the condensin protein I and/or II complexes. As the chromosomes form, the nuclear membrane and nucleoli disintegrate and disappear, making the chromatin visible.

      Before prophase, the cell’s DNA is replicated during interphase, resulting in identical pairs of chromosomes called chromatids. These chromatids attach to each other at a DNA element called the centromere. DNA and centrosome duplication occur during interphase, while chromosome alignment takes place during metaphase. The nuclear membrane and nucleoli re-form during telophase, and the sister chromatids separate during anaphase.

      In summary, prophase is the initial stage of eukaryotic mitosis where chromatin condenses into chromosomes, and the nuclear membrane and nucleoli disappear. Chromosome alignment, DNA and centrosome duplication, and re-formation of the nuclear membrane and nucleoli occur in subsequent stages.

    • This question is part of the following fields:

      • Basic Sciences
      25.1
      Seconds
  • Question 4 - What is the primary role of the nucleus in a eukaryotic cell? ...

    Correct

    • What is the primary role of the nucleus in a eukaryotic cell?

      Your Answer: To regulate gene transcription and translation

      Explanation:

      The Nucleus: Control Centre of the Cell

      The nucleus is the control centre of the cell, responsible for regulating gene transcription from DNA into mRNA and from mRNA into peptide/protein synthesis. Eukaryotic cells have a membrane-enclosed organised nucleus, while prokaryotic cells lack this structure. The nuclear structure consists of an outer and inner nuclear membrane that form the nuclear envelope, which has nuclear pores allowing the movement of water-soluble molecules. Inside the nucleus is the nucleoplasm containing the nuclear lamina, a dense fibrillar network that acts as a skeleton and regulates DNA replication and cell division. The nucleus also contains nucleoli, structures involved in the formation of ribosomes responsible for mRNA translation.

      Although the incorrect answer options above describe processes in which the nucleus is involved, none of them constitutes its main function within the cell.

    • This question is part of the following fields:

      • Basic Sciences
      19.4
      Seconds
  • Question 5 - What are the typical clinical manifestations of a deficiency in vitamin B6 (pyridoxine)?...

    Incorrect

    • What are the typical clinical manifestations of a deficiency in vitamin B6 (pyridoxine)?

      Your Answer: Renal impairment

      Correct Answer: Sensory neuropathy

      Explanation:

      The Importance of Pyridoxine in the Body

      Pyridoxine is a group of B-vitamins that are crucial in various bodily functions. They act as essential cofactors in many reactions, particularly in the metabolism of amino acids and neurotransmitters. Pyridoxine also plays a role in regulating gene transcription and controlling steroid hormones.

      The body can produce pyridoxine through bacterial flora in the gut, and it is also present in many dietary sources. However, overheating certain foods can destroy pyridoxine, and some medications can alter its metabolism. Pyridoxine is also used therapeutically to prevent neuropathy in the treatment of tuberculosis.

      Deficiency in pyridoxine can lead to sensory neuropathy, skin changes, and damage to mucous membranes. On the other hand, deficiency in vitamin C can cause gingivitis and increased bleeding, while vitamin K deficiency can also lead to bleeding. Sleep disturbance is rarely attributed to vitamin B3 (niacin) deficiency.

      In summary, pyridoxine is a vital nutrient that plays a crucial role in various bodily functions. Its deficiency can lead to various health problems, highlighting the importance of maintaining adequate levels of this vitamin in the body.

    • This question is part of the following fields:

      • Basic Sciences
      18.7
      Seconds
  • Question 6 - At what stage of eukaryotic mitosis do the centromeres of chromosomes separate? ...

    Correct

    • At what stage of eukaryotic mitosis do the centromeres of chromosomes separate?

      Your Answer: Anaphase

      Explanation:

      Chromosome Division during Anaphase

      Chromosomes are joined together in an X shape at the centromere. During anaphase, the centromeres break down and the chromosomes divide into two identical pairs called sister chromatids. These sister chromatids then move to opposite sides of the cell along a network of spindle fibres. When the cell divides during telophase, each daughter cell receives one sister chromatid from the parent cell. This ensures the accurate copying and propagation of genes. The process of chromosome division during anaphase is crucial for the proper distribution of genetic material in cells.

    • This question is part of the following fields:

      • Basic Sciences
      7.5
      Seconds
  • Question 7 - What is the main role of the Golgi apparatus in eukaryotic cells? ...

    Incorrect

    • What is the main role of the Golgi apparatus in eukaryotic cells?

      Your Answer: Synthesises proteins

      Correct Answer: Process of proteins

      Explanation:

      The Golgi Apparatus, Cell Division, and Homeostasis

      The Golgi apparatus is a structure found in eukaryotic cells that consists of flattened membrane stacks. Its primary function is to modify proteins that have been synthesized in the rough endoplasmic reticulum, preparing them for secretion or transport within the cell. However, the Golgi apparatus is not directly involved in cell division, which is controlled by the nucleus.

      Cell homeostasis, on the other hand, is primarily maintained by membrane-embedded channels or proteins such as the sodium-potassium pump. This mechanism ensures that the cell’s internal environment remains stable. The sodium-potassium pump is an active transport mechanism that involves the binding of three intracellular sodium ions to the protein. Adenosine triphosphate (ATP) donates a phosphate group to the protein, which causes it to change shape and release the sodium ions out of the cell.

      The protein then accepts two extracellular potassium ions, and the donated phosphate group detaches, causing the protein to revert to its original shape. This allows the potassium ions to enter the cell, increasing the intracellular potassium concentration and decreasing the intracellular sodium concentration. This process is in contrast to the extracellular conditions.

      In summary, the Golgi apparatus modifies proteins for secretion or transport, while cell division is controlled by the nucleus. Cell homeostasis is maintained by membrane-embedded channels or proteins such as the sodium-potassium pump, which actively transports ions to stabilize the cell’s internal environment.

    • This question is part of the following fields:

      • Basic Sciences
      12.8
      Seconds
  • Question 8 - What is a good dietary source of vitamin A? ...

    Incorrect

    • What is a good dietary source of vitamin A?

      Your Answer: White cabbage

      Correct Answer: Liver

      Explanation:

      The Importance of Vitamin A in Our Body

      Vitamin A is an essential nutrient that can be found in various sources such as liver, fish liver oils, dark green leafy vegetables, carrots, and mangoes. It can also be added to certain foods like cereals and margarines. This nutrient plays a crucial role in our body as it is required for vision, growth and development of tissues, regulation of gene transcription, and synthesis of hydrophobic glycoproteins and parts of the protein kinase enzyme pathways.

      One of the primary functions of vitamin A is to support our vision. It is a component of rhodopsin, a pigment that is necessary for the rod cells of the retina. Without vitamin A, our eyesight can be compromised, leading to various eye problems. Additionally, vitamin A is also essential for the growth and development of many types of tissues in our body. It helps in maintaining healthy skin, teeth, and bones.

      Moreover, vitamin A is involved in regulating gene transcription, which is the process of converting DNA into RNA. This nutrient also plays a role in the synthesis of hydrophobic glycoproteins and parts of the protein kinase enzyme pathways. These processes are essential for the proper functioning of our body.

      In conclusion, vitamin A is a vital nutrient that our body needs to function correctly. It is essential for our vision, growth and development of tissues, regulation of gene transcription, and synthesis of hydrophobic glycoproteins and parts of the protein kinase enzyme pathways. Therefore, it is crucial to include vitamin A-rich foods in our diet or take supplements if necessary.

    • This question is part of the following fields:

      • Basic Sciences
      6
      Seconds
  • Question 9 - Over the last five years, the total number of patients admitted and deaths...

    Correct

    • Over the last five years, the total number of patients admitted and deaths in the East and North Hertfordshire NHS Trust have been recorded. In the year 2010/2011, there were 95,071 patients admitted and 1,912 deaths. What is the crude mortality ratio for this group in that year (per 100 admissions)?

      Your Answer: 2

      Explanation:

      In this scenario, the crude mortality ratio is established by comparing the number of deaths occurring within the hospital in a given year to the total number of admissions, disregarding age or gender-specific mortality rates. For instance, with 1,912 deaths out of 95,071 admissions, the ratio computes to 0.02, or 2.0% when calculated per 100 admissions (1,912/95,071 = 0.02/100= 2.0%. When recalculated per 1,000 admissions, the crude admission rate would be 20 per 1,000.

    • This question is part of the following fields:

      • Basic Sciences
      53.5
      Seconds
  • Question 10 - A 65-year-old patient with suspected spinal cord compression has been admitted to the...

    Incorrect

    • A 65-year-old patient with suspected spinal cord compression has been admitted to the neurosurgical team for an urgent MRI of the spine. Which particle's magnetic properties does magnetic resonance imaging rely predominantly upon?

      Your Answer: Injected radioactive isotopes, for example, technetium-99

      Correct Answer: Hydrogen ion (proton)

      Explanation:

      How MRI Scanners Use Hydrogen Ions to Create Images

      MRI scanners use the magnetic properties of hydrogen ions, also known as protons, to create images of the human body. These protons have nuclear spin, which means they have magnetic vectors that can be aligned in an electromagnet. The scanner bombards the protons with radiofrequency radiation, causing them to release energy when they return to their resting state. This energy release is recorded and used to construct the MRI image.

      While other nuclei, such as carbon 13, also have nuclear spin and could be used in MRI imaging, hydrogen ions are much more abundant in human tissues. This makes them the preferred choice for creating images of the body. The process of aligning the magnetic vectors of the protons and then recording their energy release is repeated many times to create a detailed image of the body’s internal structures.

      Overall, MRI scanners use the magnetic properties of hydrogen ions to create detailed images of the human body. This non-invasive imaging technique has revolutionized medical diagnosis and treatment, allowing doctors to see inside the body without the need for surgery.

    • This question is part of the following fields:

      • Basic Sciences
      15.9
      Seconds
  • Question 11 - What factor causes a shift of the oxygen dissociation curve to the left?...

    Correct

    • What factor causes a shift of the oxygen dissociation curve to the left?

      Your Answer: Increased pH

      Explanation:

      The Oxygen Dissociation Curve and its Effects on Oxygen Saturation

      The oxygen dissociation curve is a graph that compares the oxygen saturation of hemoglobin (Hb) at different partial pressures of oxygen. When more oxygen is needed by the tissues, the curve shifts to the right. This means that at the same partial pressure of oxygen, less oxygen is bound to Hb, allowing it to be released to the tissues. This effect is caused by increased levels of CO2 and temperature, which assist in the transfer of oxygen to more metabolically active tissues. Additionally, increased levels of 2,3-DPG also aid in this process.

      On the other hand, a left shift in the curve reflects conditions where there is less need for oxygen in the tissues, such as in the lungs. This allows for increased binding of oxygen to Hb, allowing it to be taken up before transport to the tissues that require it. Overall, the oxygen dissociation curve plays a crucial role in regulating oxygen saturation in the body and ensuring that oxygen is delivered to the tissues that need it most.

    • This question is part of the following fields:

      • Basic Sciences
      17.4
      Seconds
  • Question 12 - A couple in their late 20s comes to your clinic seeking advice regarding...

    Incorrect

    • A couple in their late 20s comes to your clinic seeking advice regarding the possibility of their children inheriting cystic fibrosis. The husband has a confirmed diagnosis of the condition, but the carrier status of the wife is unknown.

      What is the likelihood of any of their offspring being affected by cystic fibrosis?

      Your Answer: 50%

      Correct Answer: 2.50%

      Explanation:

      Cystic Fibrosis Inheritance

      Cystic fibrosis (CF) is a genetic disorder that affects the chloride ion channels, leading to the thickening of respiratory and other secretions. It is an autosomal recessive condition, which means that a person must inherit two copies of the defective gene, one from each parent, to develop the disease. The most common defective allele is carried by approximately 1 in 20 people.

      If a man with CF has children with a woman who does not carry the recessive gene, then none of their children will be affected by the disease. However, they will all be carriers of the CF gene. On the other hand, if the woman is a carrier of the CF gene, there is a 50% chance that each child will inherit one copy of the defective gene from each parent and be affected by the disease. The remaining 50% of the children will inherit one copy of the defective gene and one normal gene, making them carriers of the CF gene but not affected by the disease.

      In summary, the probability of any child being affected by CF is 2.5% if one parent has the defective gene and the other does not. It is important for individuals who are carriers of the CF gene to be aware of their status and seek genetic counseling before planning to have children.

    • This question is part of the following fields:

      • Basic Sciences
      13.7
      Seconds
  • Question 13 - What stage of cellular respiration is responsible for the production of pyruvic acid?...

    Incorrect

    • What stage of cellular respiration is responsible for the production of pyruvic acid?

      Your Answer: Krebs cycle

      Correct Answer: Glycolysis

      Explanation:

      The Versatility of Pyruvic Acid in Cellular Metabolism

      Pyruvic acid is a simple alpha-keto acid that plays a crucial role in several metabolic pathways within the cell. It serves as a central intersection where different pathways converge and diverge. One of the primary ways pyruvic acid is produced is through glycolysis, where glucose is broken down into pyruvic acid. Depending on the cell’s needs, pyruvic acid can be converted back into glucose through gluconeogenesis or used to synthesize fatty acids through the acetyl-CoA pathway. Additionally, pyruvic acid can be used to produce the amino acid alanine.

      Pyruvic acid is also involved in respiration, where it enters the Krebs cycle under aerobic conditions. This cycle produces energy in the form of ATP, which is used by the cell for various functions. Under anaerobic conditions, pyruvic acid can ferment into lactic acid, which is used by some organisms as a source of energy.

      In summary, pyruvic acid is a versatile molecule that plays a critical role in cellular metabolism. Its ability to be converted into different molecules depending on the cell’s needs makes it an essential component of many metabolic pathways.

    • This question is part of the following fields:

      • Basic Sciences
      11.3
      Seconds
  • Question 14 - What is the primary means of transportation for vitamin D in the human...

    Incorrect

    • What is the primary means of transportation for vitamin D in the human body?

      Your Answer: In blood, unbound

      Correct Answer: In blood, bound to the group specific component

      Explanation:

      The Role of UV Light and Vitamin D in Calcium and Phosphate Regulation

      In order for the body to produce Vitamin D3, UV light at a specific wavelength is required to convert cholesterol in the skin. Vitamin D2 and D3 are then transported in the bloodstream bound to the Vitamin-D Binding Protein and undergo further modifications in the liver and kidney to become the active form, 1,25 (OH)2Vitamin D. This active form plays a crucial role in regulating calcium and phosphate concentrations in the body.

      1,25 (OH)2Vitamin D increases calcium absorption in the duodenum and inhibits the secretion and synthesis of PTH, which helps to maintain calcium concentrations. It also increases phosphate absorption in the jejunum and ileum, which is important for maintaining phosphate concentrations. Additionally, 1,25 (OH)2Vitamin D promotes bone turnover by stimulating both osteoblast and osteoclast activity.

      Overall, the production and activation of Vitamin D through UV light and dietary sources is essential for proper calcium and phosphate regulation in the body.

    • This question is part of the following fields:

      • Basic Sciences
      6.1
      Seconds
  • Question 15 - Of which cellular structure is the fibrillar centre a component? ...

    Correct

    • Of which cellular structure is the fibrillar centre a component?

      Your Answer: The nucleolus

      Explanation:

      The Fibrillar Centre in the Nucleolus

      The fibrillar centre is a crucial component of the nucleolus, which is found in most metazoan nucleoli, particularly in higher eukaryotes. Along with the dense fibrillar components and the granular component, it forms the three major components of the nucleolus. During the end of mitosis, the fibrillar centre serves as a storage point for nucleolar ribosomal chromatin and associated ribonucleoprotein transcripts. As the nucleolus becomes active, the ribosomal chromatin and ribonucleoprotein transcripts begin to form the dense fibrillar components, which are more peripherally located and surround the fibrillar centres. The transcription zone for multiple copies of the pre-rRNA genes is the border between these two structures. It is important to note that the fibrillar centre is not a component of any of the cell structures mentioned in the incorrect answer options.

    • This question is part of the following fields:

      • Basic Sciences
      12.8
      Seconds
  • Question 16 - To what type of cell can mesenchymal stem cells transform? ...

    Incorrect

    • To what type of cell can mesenchymal stem cells transform?

      Your Answer: Skin cells

      Correct Answer: Osteoblasts

      Explanation:

      Mesenchymal Cells: The Stem Cells of the Human Skeleton

      Mesenchymal cells are the primary stem cells of the human skeleton. These multipotent cells originate in the bone marrow and have the ability to differentiate into various cell types. Osteoblasts, responsible for bone formation, chondrocytes, which give rise to cartilage, and adipocytes, specialized in storing energy as fat, are some of the cells that mesenchymal cells can produce. Muscle cells, or myocytes, arise from muscle satellite cells, while skin cells come from epithelial stem cells. Neurons mostly arise from neural stem cells, although some may come from astrocytes. White blood cells, on the other hand, come from hematopoietic stem cells. Mesenchymal cells play a crucial role in the maintenance and repair of the human skeleton, making them an essential area of study in regenerative medicine.

    • This question is part of the following fields:

      • Basic Sciences
      10.8
      Seconds
  • Question 17 - Which statement regarding microtubules is accurate in relation to Chédiak-Higashi syndrome? ...

    Correct

    • Which statement regarding microtubules is accurate in relation to Chédiak-Higashi syndrome?

      Your Answer: They are arranged in a 9+2 formation in cilia

      Explanation:

      Microtubules and Chédiak-Higashi Syndrome

      Microtubules are made up of alpha and beta tubulin dimers that are arranged in a helix and can be added or removed to change the length. They are found in structures such as flagella, mitotic spindles, and cilia, where they have a 9+2 arrangement. These structures are important for cell movement and division. Chemotherapy agents, such as taxanes, target microtubules and are used in breast cancer treatment.

      Chédiak-Higashi syndrome is a rare inherited immunodeficiency disorder caused by mutations in the LYST gene. This condition is characterized by neutrophil inclusions, albinism, recurrent infections, and peripheral neuropathy. The neutrophil inclusions are thought to be caused by abnormal microtubule function, which affects the immune system’s ability to fight infections. While there is no cure for Chédiak-Higashi syndrome, treatment focuses on managing symptoms and preventing infections.

    • This question is part of the following fields:

      • Basic Sciences
      23.8
      Seconds
  • Question 18 - What are the vitamins that are soluble in fat? ...

    Incorrect

    • What are the vitamins that are soluble in fat?

      Your Answer: Vitamins D, E and K

      Correct Answer: Vitamins A, D, E and K

      Explanation:

      Absorption of Fat-Soluble Vitamins

      Fat-soluble vitamins, namely A, D, E, and K, have a different absorption process compared to water-soluble vitamins. In the gut, these vitamins are combined with other fat-soluble substances such as monoacylglycerols and cholesterol to form micelles. These micelles are then transported to the lymphatic system and eventually enter the bloodstream through the subclavian vein.

      However, any issues that affect the absorption of fats will also impact the absorption of fat-soluble vitamins. This means that individuals with conditions that affect fat absorption, such as cystic fibrosis or celiac disease, may have difficulty absorbing these vitamins. It is important to ensure adequate intake of fat-soluble vitamins through a balanced diet or supplements to prevent deficiencies and associated health problems.

    • This question is part of the following fields:

      • Basic Sciences
      7.9
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  • Question 19 - What role does vitamin K play in the body? ...

    Correct

    • What role does vitamin K play in the body?

      Your Answer: Activation of clotting factors II, VII, IX, X

      Explanation:

      The Roles of Vitamin K in the Body

      Vitamin K plays several important roles in the body. One of its main functions is to modify clotting factors II, VII, IX, and X through a process called carboxylation. This modification allows calcium to bind to the factors, which is necessary for them to participate in the clotting pathway. This principle is used in full blood counts to prevent clotting by adding EDTA, which chelates the calcium. Vitamin K also modifies osteocalcin and matrix proteins in bone, as well as nephrocalcin in the kidney, in a similar way.

      In addition to its role in blood clotting and bone health, vitamin K is also important for nervous tissue development and growth. However, vitamin K antagonists such as warfarin are sometimes used as anticoagulants to prevent blood clots. It is important to follow guidelines and instructions carefully when using these medications. Overall, vitamin K plays a crucial role in maintaining the health and function of various systems in the body.

    • This question is part of the following fields:

      • Basic Sciences
      9.8
      Seconds
  • Question 20 - What is the primary factor that increases the risk of thiamine (vitamin B1)...

    Correct

    • What is the primary factor that increases the risk of thiamine (vitamin B1) deficiency?

      Your Answer: Chronic alcohol excess

      Explanation:

      Thiamine: Its Roles, Sources, Deficiency States, and Manifestations

      Thiamine is a vital nutrient that plays several roles in the body. It acts as a cofactor to enzymes involved in energy production, metabolism of branched chain amino acids, and regulation of nerve and muscle action potentials. It is found in many foods, including wheat, oats, and yeast-containing products. However, deficiency states can occur in chronic alcohol dependence, renal dialysis, and cultures that mainly consume white rice. The deficiency can manifest as ‘dry’ beriberi, which causes peripheral neuropathy, muscle weakness, fatigue, and reduced concentration, or ‘wet’ beriberi, which also involves heart failure and edema. In severe cases, Wernicke-Korsakoff syndrome can develop, which is an emergency requiring urgent IV replacement of thiamine. If left untreated, it can lead to irreversible amnesia, confabulation, and dementia. Therefore, all patients with alcohol-related admissions should be considered for Pabrinex, a B vitamin infusion.

    • This question is part of the following fields:

      • Basic Sciences
      6.1
      Seconds
  • Question 21 - What occurs during metaphase II of meiosis? ...

    Correct

    • What occurs during metaphase II of meiosis?

      Your Answer: The cell's chromosomes attach to the meiotic spindle to divide into chromatids

      Explanation:

      The Process of Meiosis

      Meiosis is a complex process that involves two major cycles. The first cycle, meiosis I, condenses the reproductive cell’s DNA into chromosomes that are then replicated, creating two pairs of each original chromosome. These pairs are then separated, and the cell divides with one chromosome in each daughter cell. The second cycle, meiosis II, splits the chromosomes into individual chromatids, which are then separated as in meiosis I. This separation is facilitated by a spindle, a set of parallel fibers that attach to the center of each chromosome and split into two, making the chromatids travel on the polar opposite sides of the cell. The cell then divides again, giving rise to four haploid daughter cells.

      During meiosis II, the chromosomes align on the spindle in metaphase II. Tetrads separate during anaphase I and line up during metaphase I. Sister chromatids separate on the meiotic spindle during anaphase II. Finally, chromosomes uncoil and lengthen at the end of meiosis, in telophase II. This process is essential for the production of gametes and the continuation of sexual reproduction in many organisms.

    • This question is part of the following fields:

      • Basic Sciences
      12.6
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  • Question 22 - The diabetes prevention program has been running for the last 5 years. At...

    Incorrect

    • The diabetes prevention program has been running for the last 5 years. At baseline, a well conducted study with a sample size of 500 showed that the prevalence of diabetes among adults aged 40 and above was 15%.
      Five years later another survey (of 400 responders) showed that the prevalence of diabetes was 10%.
      In the above example, which definition of prevalence is correct?

      Your Answer: Prevalence is the numbers of new and old smokers at baseline and at 10 years

      Correct Answer: Prevalence is the number of new and old smokers in a year

      Explanation:

      Prevalence and Incidence in Smoking

      Prevalence and incidence are two important concepts in the smoking habits of a population. Prevalence refers to the number of people who smoke at a particular time point, such as at the beginning or end of a study period. This is calculated by dividing the number of smokers by the total population.

      On the other hand, incidence refers to the number of new cases of smoking at a particular time point. For example, this could be at the beginning of a study period for the whole year or at the 10th year. This is calculated by dividing the number of new smokers by the number of smoke-free individuals who are potentially at risk of taking up smoking.

      prevalence and incidence is important in evaluating the effectiveness of smoking cessation programs and policies. By tracking changes in prevalence and incidence over time, researchers and policymakers can determine whether their efforts are making a difference in reducing smoking rates. Additionally, these concepts can help identify populations that are at higher risk of taking up smoking, allowing for targeted interventions to prevent smoking initiation.

    • This question is part of the following fields:

      • Basic Sciences
      63.1
      Seconds
  • Question 23 - What is the cause of the symptoms of weakness, dermatitis, diarrhoea and dementia...

    Incorrect

    • What is the cause of the symptoms of weakness, dermatitis, diarrhoea and dementia in pellagra?

      Your Answer: Genetic disease affecting haemoglobin

      Correct Answer: Deficiency of the vitamin niacin

      Explanation:

      Niacin Deficiency and Other Genetic Diseases

      Niacin, a vitamin present in two forms – nicotinamide and nicotinic acid, is found in a variety of plant and animal foodstuffs. However, in some cases, the form of the vitamin is not easily absorbed by the human body, leading to deficiency. This deficiency is common in areas where maize is the primary dietary carbohydrate. Additionally, niacin can be produced by the body from the amino acid tryptophan. Diseases that affect the availability of tryptophan, such as Hartnup disease and carcinoid syndrome, can also result in niacin deficiency.

      Pellagra is a condition that arises from niacin deficiency. It initially presents with non-specific symptoms such as nausea, fatigue, and reduced appetite, followed by pigmented dermatitis in sun-exposed areas, gastrointestinal disturbance, mood disturbance, and dementia in severe cases.

      Apart from niacin deficiency, genetic diseases affecting collagen synthesis, such as Ehlers Danlos, present with symptoms of fragile stretchy skin and joint hypermobility. Genetic diseases affecting haemoglobin, such as sickle cell anaemia, present with symptoms of pain, hepatosplenomegaly, shortness of breath, and anaemia. Deficiencies in B12 and folate can also lead to macrocytic anaemia, paresthesia, and lethargy.

      In conclusion, the causes and symptoms of niacin deficiency and other genetic diseases is crucial for early diagnosis and effective treatment. A balanced diet and regular medical check-ups can help prevent and manage these conditions.

    • This question is part of the following fields:

      • Basic Sciences
      23
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  • Question 24 - What is the term for the process described below in laboratory testing?

    Enzymes...

    Correct

    • What is the term for the process described below in laboratory testing?

      Enzymes are immobilised on a solid surface, such as a bead or well, and allowed to come into contact with the sample. After washing, another enzyme is added with a label allowing quantitation of the analyte.

      Your Answer: Enzyme-linked immunosorbent assay

      Explanation:

      ELISA: A Common Immunoassay in Medical Diagnostic Testing

      An enzyme-linked immunosorbent assay (ELISA) is a type of immunoassay that is widely used in medical diagnostic testing. This method uses antibodies to identify and/or quantify the analyte being tested. The ELISA process involves several steps, including coating a plate with the antigen, adding the patient’s sample, washing the plate to remove any unbound material, adding an enzyme-linked antibody, washing the plate again, and adding a substrate to produce a measurable signal.

      Over time, many modifications have been made to the ELISA, making it a versatile tool in the laboratory for measuring various analytes. Some of the substances that can be measured using immunoassays include thyroid hormone, testosterone, oestrogen, troponin, and vitamin D. The ELISA has been around for a long time and is still widely used today due to its accuracy, sensitivity, and specificity.

    • This question is part of the following fields:

      • Basic Sciences
      22.4
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  • Question 25 - A couple in their early 30s come to your clinic seeking advice. The...

    Incorrect

    • A couple in their early 30s come to your clinic seeking advice. The husband has a history of haemophilia B and they are worried about the possibility of passing it on to their children. Can you determine which of their offspring will be affected by the disease?

      Your Answer: Half of the daughters will be carriers; all sons will be affected

      Correct Answer: All daughters will be carriers; no sons will be affected

      Explanation:

      The inheritance of Haemophilia A and B is crucial in identifying individuals who are at risk of developing the condition. Haemophilia A and B are genetic disorders that are inherited in an X-linked recessive manner. Haemophilia A is caused by a deficiency in clotting factor VIII, while haemophilia B is caused by a deficiency in clotting factor IX.

      On the other hand, haemophilia C, which is caused by a deficiency in clotting factor XI, is primarily inherited in an autosomal recessive manner. In X-linked recessive conditions like haemophilia B, males are more likely to be affected than females. This is because males only need one abnormal copy of the gene, which is carried on the X chromosome, to be affected.

      Females, on the other hand, can be carriers of the condition if they carry one normal and one abnormal copy of the gene. While carriers can have clotting abnormalities, these are usually milder than those seen in affected individuals. Men cannot pass the condition to their sons, but they will pass on the abnormal X chromosome to all their daughters, who will be carriers.

      Female carriers can pass on the condition to around half their sons, and half their daughters will be carriers. Females can only be affected if they are the offspring of an affected male and a carrier female. In summary, the inheritance of haemophilia A and B is crucial in identifying individuals who are at risk of developing the condition. It also helps in providing appropriate genetic counseling and management for affected individuals and their families.

    • This question is part of the following fields:

      • Basic Sciences
      65.2
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  • Question 26 - What is the final product of glycolysis besides ATP? ...

    Correct

    • What is the final product of glycolysis besides ATP?

      Your Answer: Pyruvate

      Explanation:

      Glycolysis: The Energy-Producing Reaction

      Glycolysis is a crucial energy-producing reaction that converts glucose into pyruvate while releasing energy to create ATP and NADH+. It is one of the three major carbohydrate reactions, along with the citric acid cycle and the electron transport chain. The reaction involves ten enzymatic steps that provide entry points to glycolysis, allowing for a variety of starting points. The most common starting point is glucose or glycogen, which produces glucose-6-phosphate.

      Glycolysis occurs in two phases: the preparatory (or investment) phase and the pay-off phase. In the preparatory phase, ATP is consumed to start the reaction, while in the pay-off phase, ATP is produced. Glycolysis can be either aerobic or anaerobic, but it does not require nor consume oxygen.

      Although other molecules are involved in glycolysis at some stage, none of them form its end product. Lactic acid is associated with anaerobic glycolysis. glycolysis is essential for how the body produces energy from carbohydrates.

    • This question is part of the following fields:

      • Basic Sciences
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      Seconds
  • Question 27 - What is the fundamental meaning of carbohydrate? ...

    Correct

    • What is the fundamental meaning of carbohydrate?

      Your Answer: A compound following the formula Cx(H2O)y

      Explanation:

      Carbohydrates: Building Blocks of Energy and Storage

      Carbohydrates are organic compounds made up of carbon, hydrogen, and oxygen, with a general formula of Cx(H2O)y. They can be classified as either aldehydes or ketones and contain multiple hydroxyl groups. Monosaccharides are the simplest form of carbohydrates, consisting of a single unit. They are categorized based on the number of carbon atoms they contain, with trioses having three, pentoses having five, and hexoses having six carbon atoms. These monosaccharides are essential for energy production and building larger carbohydrate structures.

      Disaccharides are formed when two monosaccharides are joined together through a condensation reaction, releasing a water molecule. The most common disaccharides are lactose, maltose, and sucrose. Polysaccharides, on the other hand, are long, branched polymers made up of multiple single units. They serve as convenient storage molecules for energy reserves, such as glycogen in humans and starch in plants.

      In summary, carbohydrates are vital building blocks for energy production and storage in living organisms. Monosaccharides, disaccharides, and polysaccharides all play important roles in maintaining the body’s energy balance and overall health.

    • This question is part of the following fields:

      • Basic Sciences
      10.9
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  • Question 28 - The Krebs or TCA cycle is a series of metabolic processes beginning with...

    Incorrect

    • The Krebs or TCA cycle is a series of metabolic processes beginning with the synthesis of citrate from acetyl-CoA which results in a number of important metabolic products. Where in the cell does this cycle occur?

      Your Answer: Smooth endoplasmic reticulum

      Correct Answer: Mitochondria

      Explanation:

      Cellular Processes and Organelles

      Metabolic processes in the cell occur in specific locations. Acetyl-CoA production and the Krebs cycle take place in the mitochondrium, while glycolysis occurs in the cytoplasm. The nucleus is the central structure of the cell that contains DNA and is double membrane-bound. The rough endoplasmic reticulum is responsible for packaging and transporting proteins, while the smooth endoplasmic reticulum performs a similar function but lacks ribosomes.

      It is important to understand where these processes occur in the cell to better understand their functions and how they contribute to the overall functioning of the cell. The mitochondrium is responsible for producing energy in the form of ATP, while the cytoplasm is where glucose is broken down during glycolysis. The nucleus is where genetic information is stored and replicated, and the endoplasmic reticulum is involved in protein synthesis and transport.

      In summary, the cell is a complex system with various organelles that perform specific functions. where these processes occur in the cell is crucial to how they contribute to the overall functioning of the cell.

    • This question is part of the following fields:

      • Basic Sciences
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  • Question 29 - What role does the nucleolus play in eukaryotic cells? ...

    Correct

    • What role does the nucleolus play in eukaryotic cells?

      Your Answer: To transcribe ribosomal RNA and assemble ribosomes

      Explanation:

      The Nucleolus: Structure and Function

      The nucleolus is a non-membrane-bound structure that takes up about a quarter of the nuclear volume. It is composed mainly of proteins and nucleic acids and is responsible for transcribing ribosomal RNA (rRNA) and assembling ribosomes in the cell. Nucleoli are formed in nucleolar organizing regions (NORs), which are also the regions of the genes for three of the four eukaryotic rRNAs.

      During ribosome assembly, ribosomal proteins enter the nucleolus from the cytoplasm and begin to assemble on an rRNA precursor. As the pre-rRNA is cleaved to produce 5.8S, 18S, and 28S rRNAs, additional ribosomal proteins and the 5S rRNA (which is synthesized elsewhere in the nucleus) assemble to form preribosomal subunits. These subunits then exit the nucleolus into the cytoplasm and combine to produce the final 40S and 60S ribosomal subunits.

      Overall, the nucleolus plays a crucial role in protein synthesis by producing the components necessary for ribosome assembly. Its unique structure and function make it an essential component of the cell’s machinery.

    • This question is part of the following fields:

      • Basic Sciences
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  • Question 30 - What could be a potential cause of metabolic acidosis? ...

    Incorrect

    • What could be a potential cause of metabolic acidosis?

      Your Answer: Voluntary hyperventilation

      Correct Answer: Poorly controlled diabetes

      Explanation:

      Acid-Base Imbalances in Different Medical Conditions

      Poorly controlled diabetes can cause the breakdown of fatty acids, leading to the production of ketones as an alternative energy source. However, an excess of ketones can result in metabolic acidosis due to their acidic nature. On the other hand, chronic obstructive pulmonary disease (COPD) and suffocation can cause the retention of carbon dioxide, leading to respiratory acidosis. In COPD, there may be a compensatory metabolic alkalosis. Voluntary hyperventilation can cause respiratory alkalosis due to the reduction of carbon dioxide. Vomiting can also lead to metabolic alkalosis. Diabetic ketoacidosis is a complication of type 1 diabetes that results in high blood sugar levels, ketone production, and acidosis.

      In summary, different medical conditions can cause acid-base imbalances in the body. It is important to identify the underlying cause of the imbalance to provide appropriate treatment.

    • This question is part of the following fields:

      • Basic Sciences
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  • Question 31 - Which statement regarding microtubules is accurate in relation to Chediak-Higashi syndrome? ...

    Correct

    • Which statement regarding microtubules is accurate in relation to Chediak-Higashi syndrome?

      Your Answer: They are arranged in a 9+2 formation in cilia

      Explanation:

      Microtubules and Chediak-Higashi Syndrome

      Microtubules are structures composed of alpha and beta tubulin dimers that are arranged in a helix and can be added or removed to vary the length. They are found in flagella, mitotic spindles, and cilia, where they have a 9+2 arrangement. Chemotherapy agents, such as taxanes, target microtubules in breast cancer treatment.

      Chediak-Higashi syndrome is an autosomal recessive condition that presents with albinism, bleeding and bruising due to platelet dysfunction, and susceptibility to infections due to abnormal neutrophils. The LYST gene is responsible for lysosomal trafficking proteins and is affected in this syndrome.

      In summary, microtubules are important structures in various cellular processes and are targeted in cancer treatment. Chediak-Higashi syndrome is a rare genetic disorder that affects lysosomal trafficking proteins and presents with various symptoms.

    • This question is part of the following fields:

      • Basic Sciences
      12.5
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  • Question 32 - A 50-year-old female patient presents to the vascular clinic for evaluation of varicose...

    Correct

    • A 50-year-old female patient presents to the vascular clinic for evaluation of varicose veins. During the assessment, a test is conducted to determine the site of incompetence. The patient is instructed to lie down, and her legs are raised to empty the veins. A constricting band is then placed below the sapheno-femoral junction, and the patient is asked to stand up to observe for varicose vein filling. What is the name of this test?

      Your Answer: Tourniquet test

      Explanation:

      Tests for Varicose Veins and Arterial Insufficiency

      The Trendelenburg and tourniquet tests are both used to evaluate the site of incompetence in varicose veins at the sapheno-femoral junction. During the Trendelenburg test, the examiner applies pressure with their fingers over the junction, while in the tourniquet test, a tourniquet is placed just below the junction. If the veins fill rapidly upon standing, it suggests that the sapheno-femoral junction is not the source of the incompetence.

      Buerger’s test is used to assess the arterial circulation of the lower limb. The lower the angle at which blanching occurs, the more likely there is arterial insufficiency. This test is important in diagnosing peripheral artery disease.

      The ankle-brachial pressure index (ABPI) is another test used to assess arterial insufficiency. Blood pressure cuffs are used to measure the systolic blood pressure in the ankle and arm. The ratio of the two pressures is calculated, and a lower ratio indicates a higher degree of claudication.

      Finally, Perthe’s test is used to assess the patency of the deep femoral vein before varicose vein surgery. This test involves compressing the vein and observing the filling of the superficial veins. If the superficial veins fill quickly, it suggests that the deep femoral vein is patent and can be used for surgery.

      In summary, these tests are important in diagnosing and evaluating varicose veins and arterial insufficiency. They help healthcare professionals determine the best course of treatment for their patients.

    • This question is part of the following fields:

      • Basic Sciences
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  • Question 33 - Which of the following would not increase the rate of diffusion of a...

    Incorrect

    • Which of the following would not increase the rate of diffusion of a substance across a lipid membrane such as the cell wall?

      Your Answer: Area of the membrane

      Correct Answer: Thickness of the membrane

      Explanation:

      Diffusion and Fick’s Law

      Diffusion is a natural process that occurs when molecules move from an area of high concentration to an area of low concentration. This process is passive and random, meaning that it does not require any external energy input. Fick’s Law states that diffusion occurs more quickly across a large, permeable, and thin membrane. For example, in lung disease, the thickening of the alveolar epithelial barrier can lead to a poor carbon monoxide transfer coefficient because the thicker membrane slows down the diffusion process. the principles of diffusion and Fick’s Law can help us better understand how molecules move and interact in various biological and chemical processes. By optimizing the conditions for diffusion, we can improve the efficiency of many natural and artificial systems.

    • This question is part of the following fields:

      • Basic Sciences
      14
      Seconds
  • Question 34 - A 50-year-old female patient with varicose veins presents to the vascular clinic for...

    Incorrect

    • A 50-year-old female patient with varicose veins presents to the vascular clinic for evaluation.

      During the assessment, a test is conducted to determine the location of incompetence. The patient is instructed to lie down, and the veins are emptied by elevating her legs off the couch. The examiner then identifies the site of the sapheno-femoral junction and applies pressure with their fingers. The patient is then asked to stand up to evaluate vein filling.

      What is the name of this test?

      Your Answer: Tourniquet test

      Correct Answer: Trendelenburg's test

      Explanation:

      Assessing Varicose Vein Site of Incompetence

      The Trendelenburg and tourniquet tests are both used to evaluate the site of incompetence in varicose veins at the sapheno-femoral junction. During the Trendelenburg test, the examiner applies pressure with their fingers over the junction site, while in the tourniquet test, a tourniquet is placed just below the junction level.

      If the veins fill quickly upon standing, it indicates that the sapheno-femoral junction is not the source of the incompetence. These tests are essential in determining the location of the varicose vein site of incompetence, which is crucial in planning the appropriate treatment. By identifying the site of incompetence, physicians can perform targeted interventions to improve venous function and alleviate symptoms. Therefore, the Trendelenburg and tourniquet tests are valuable tools in the diagnosis and management of varicose veins.

    • This question is part of the following fields:

      • Basic Sciences
      11.4
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  • Question 35 - What is the most common method of assessing nutritional status in adults? ...

    Correct

    • What is the most common method of assessing nutritional status in adults?

      Your Answer: Body mass index

      Explanation:

      The Body Mass Index as a Measure of Nutritional Status

      The measurement and assessment of nutritional status can be challenging, and there is no single test that can provide a complete picture. However, the body mass index (BMI) is a commonly used measurement in clinical practice. The BMI is calculated by dividing a person’s weight in kilograms by their height in meters squared. This measure is used to assess adiposity and nutritional status, and it is simple and quick to calculate and interpret.

      Although the BMI is a convenient measure, it has limitations for assessing obesity in individual patients. It is best used to track trends in an individual patient’s BMI over time. In some cases, the BMI may overestimate fat mass in patients who are very tall or have a high proportion of lean tissue due to an active lifestyle. Additionally, the BMI may not be accurate for athletes and children.

      Other measurements, such as skin fold thickness and weight, can also be useful, but the BMI is generally considered the better option. The ponderal index is used specifically for children. It is important to note that albumin is not a reliable marker of nutritional status, as it can also be affected by inflammation.

      Overall, the BMI is a widely used measure of nutritional status and is recommended by the World Health Organization. However, it is important to consider its limitations and use it in conjunction with other measurements to obtain a more complete picture of a patient’s nutritional status.

    • This question is part of the following fields:

      • Basic Sciences
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  • Question 36 - In which part of the cell are the electron transport chain carriers situated?...

    Incorrect

    • In which part of the cell are the electron transport chain carriers situated?

      Your Answer: Mitochondria matrix

      Correct Answer: Mitochondrial cristae

      Explanation:

      The Electron Transport Chain in Mitochondria

      The electron transport chain (ETC) is a crucial process in cellular aerobic respiration that occurs in the mitochondrial cristae. These are folded membranes inside the organelle. During respiration, NADH and FADH produced from other parts of the process, such as glycolysis, transfer electrons from electron donors to electron acceptors through redox reactions. This electron transfer is coupled with proton transfer across the mitochondrial membrane, creating an electrochemical proton gradient. This gradient induces the production of ATP, which is used as an energy currency by the cell.

      ATP is produced through a mechanism called chemiosmotic phosphorylation. The structure of the mitochondrion is essential for this process to occur. The cristae provide a large surface area for the ETC to take place, and the mitochondrial membrane is impermeable to protons, allowing for the creation of the proton gradient. The inner membrane also contains ATP synthase, the enzyme responsible for producing ATP through chemiosmotic phosphorylation.

      In summary, the electron transport chain in mitochondria is a complex process that involves the transfer of electrons and protons across the mitochondrial membrane to create a proton gradient. This gradient is then used to produce ATP through chemiosmotic phosphorylation. The structure of the mitochondrion is crucial for this process to occur efficiently.

    • This question is part of the following fields:

      • Basic Sciences
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  • Question 37 - What is the estimated percentage of oxygen in the blood that is attached...

    Incorrect

    • What is the estimated percentage of oxygen in the blood that is attached to haemoglobin?

      Your Answer: 80%

      Correct Answer: 100%

      Explanation:

      Calculation of Oxygen in Blood

      The majority of oxygen in the blood is bound to haemoglobin, with the exact amount varying based on the oxygen saturation and haemoglobin level. To calculate the amount of oxygen per litre of blood, the formula (13.9 × Hb × sats/100) + (PaO2 × 0.03) can be used. For example, an average man with an Hb of 14, saturations of 98% on room air, and a PaO2 of 12 would have 191 ml of oxygen per litre of blood. It is important to note that only 0.36 ml of this oxygen is dissolved in the blood.

    • This question is part of the following fields:

      • Basic Sciences
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  • Question 38 - What RNA base pairs with adenine when synthesizing a complementary RNA strand from...

    Correct

    • What RNA base pairs with adenine when synthesizing a complementary RNA strand from DNA, using RNA polymerase to split the helix at specific points?

      Your Answer: Uracil

      Explanation:

      Differences between DNA and RNA

      DNA and RNA differ in several ways. The primary sugar in DNA is deoxyribose, while in RNA it is ribose. Additionally, DNA is double stranded, while RNA is single stranded. This single stranded structure with un-paired bases allows for transcription to occur when the DNA bases are freed. Each base has a specific pairing, with guanine always binding to cytosine and adenine always binding to thymine in the DNA strand. During transcription, the same complementary RNA bases assemble with the DNA bases, except for thymine, which is not an RNA base. Instead, uracil serves as the RNA pyrimidine base equivalent of thymine. Finally, lysine is an amino acid coded for by the RNA base triplet AAA, where A represents adenine.

    • This question is part of the following fields:

      • Basic Sciences
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  • Question 39 - What is the end result of meiosis in a cell? ...

    Correct

    • What is the end result of meiosis in a cell?

      Your Answer: 4 haploid cells

      Explanation:

      Meiosis

      Meiosis is a crucial process that occurs in the genetic cells of eukaryotic organisms. Its primary purpose is to recombine genes, which results in genetic variation while also ensuring genetic preservation. Although meiosis shares some similarities with mitosis, it is restricted to genetic cells, also known as gametes, of eukaryotic organisms.

      During meiosis, a gamete duplicates each of its chromosomes and divides into two diploid cells. These cells then divide into four haploid cells by the end of the second stage of meiosis (telophase II and cytokinesis). These haploid cells are either sperm cells (male) or eggs (female) in mammals. When these haploid cells fuse together, they produce a diploid zygote that contains two copies of parental genes.

      In summary, meiosis is a crucial process that ensures genetic variation and preservation in eukaryotic organisms. It involves the duplication and division of genetic cells into haploid cells, which can then fuse together to produce a diploid zygote.

    • This question is part of the following fields:

      • Basic Sciences
      8
      Seconds
  • Question 40 - What is the primary function of riboflavin in the B vitamin group? ...

    Correct

    • What is the primary function of riboflavin in the B vitamin group?

      Your Answer: Mopping up free radicals

      Explanation:

      The Role of Riboflavin in the Body

      Riboflavin, also known as vitamin B2, is a B-vitamin that plays a crucial role in the body. One of its functions is to act as an antioxidant, mopping up free radicals that can cause damage to cells. However, if the metabolites formed during this process are not excreted promptly, the free radicals can be generated again. Riboflavin is also involved in the production of blue-light sensitive pigments in the eye, which help establish the circadian rhythm. This function is not related to visual acuity.

      Riboflavin is found in a variety of foods, including milk and offal. Deficiency of this vitamin is rare, but when it does occur, it can cause non-specific effects on the skin and mucous membranes. There is no evidence of clear long-lasting damage from riboflavin deficiency. Overall, riboflavin is an important nutrient that plays a vital role in maintaining good health.

    • This question is part of the following fields:

      • Basic Sciences
      6.8
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  • Question 41 - Which food is a rich source of vitamin D in the diet? ...

    Correct

    • Which food is a rich source of vitamin D in the diet?

      Your Answer: Oily fish

      Explanation:

      Sources of Vitamin D

      Vitamin D is a type of fat-soluble vitamin that can be found in certain foods such as cheese, butter, eggs, and oily fish. However, vegetable sources of vitamin D are limited, although some foods are fortified with this vitamin. For instance, 100 grams of sundried shiitake mushrooms contain 1600 IU of vitamin D, while one egg contains 20 IU. Wild salmon is also a good source of vitamin D, with 100 grams containing 800 IU, while farmed salmon contains 200 IU.

      Aside from food sources, sunlight is also a good source of vitamin D. Exposure of arms and legs to sunlight for 10-15 minutes can provide 3000 IU of vitamin D. However, it is difficult to obtain the daily requirement of 25-50 IU of vitamin D through sunlight alone, especially for people living in temperate climates. As a result, many people may have insufficient vitamin D levels. It is important to ensure that we get enough vitamin D through a combination of food sources and sunlight exposure.

    • This question is part of the following fields:

      • Basic Sciences
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  • Question 42 - The arrangement of amphipathic phospholipids in the mammalian cell membrane, what is it...

    Correct

    • The arrangement of amphipathic phospholipids in the mammalian cell membrane, what is it like?

      Your Answer: A lipid bilayer with hydrophilic heads facing out and hydrophobic tails facing in

      Explanation:

      The Function and Structure of the Mammalian Cell Membrane

      The mammalian cell membrane serves as a protective barrier that separates the cytoplasm from the extracellular environment. It also acts as a filter for molecules that move across it. Unlike plant and prokaryotic cells, mammalian cells do not have a cell wall. The main component of the cell membrane is a bilayer of amphipathic lipids, which have a hydrophilic head and a hydrophobic tail. The phospholipids in the bilayer are oriented with their hydrophilic heads facing outward and their hydrophobic tails facing inward. This arrangement allows for the separation of the watery extracellular environment from the watery intracellular compartment.

      It is important to note that the cell membrane is not a monolayer and the phospholipids are not linked head-to-tail. This is in contrast to DNA, which has a helical chain formation. Overall, the structure and function of the mammalian cell membrane are crucial for maintaining the integrity and proper functioning of the cell.

    • This question is part of the following fields:

      • Basic Sciences
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  • Question 43 - A 10-year-old patient presents with recurrent skin cancer and is diagnosed with xeroderma...

    Incorrect

    • A 10-year-old patient presents with recurrent skin cancer and is diagnosed with xeroderma pigmentosum. What is the defective biochemical mechanism in this disease?

      Your Answer: mRNA splicing

      Correct Answer: DNA excision repair

      Explanation:

      Xeroderma Pigmentosum and DNA Repair

      Deoxyribonucleic acid (DNA) found in the skin cells can absorb ultraviolet (UV) light, which can cause the formation of pyrimidine dimers. These dimers are removed through a process called excision repair, where the damaged DNA is cut out and replaced with new DNA. However, if this process fails, it can lead to mutations in genes that suppress tumors or promote their growth, potentially leading to cancer.

      Xeroderma pigmentosum is a genetic disorder that is inherited in an autosomal recessive pattern. This means that an individual must inherit two copies of the mutated gene, one from each parent, to develop the disorder. Generally, disorders that affect metabolism or DNA replication on a cellular or genetic level are inherited in an autosomal recessive pattern. On the other hand, genetic disorders that affect larger structural components are usually inherited in an autosomal dominant pattern. While there are exceptions to these rules, they can serve as a helpful guide for exam preparation.

    • This question is part of the following fields:

      • Basic Sciences
      14.6
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  • Question 44 - You are evaluating a geriatric patient in the emergency department who has fallen...

    Incorrect

    • You are evaluating a geriatric patient in the emergency department who has fallen and needs a venous cannula for fluid resuscitation. To ensure maximum flow into the vein, you plan to apply the Hagen-Poiseuille equation to select an appropriate cannula size. Which of the following statements is true according to this law?

      Your Answer: Doubling the width of the cannula will double the flow rate

      Correct Answer: Flow will be faster through a shorter cannula

      Explanation:

      Poiseuille’s Equation and Fluid Flow in Cylinders

      Poiseuille’s equation is used to describe the flow of non-pulsatile laminar fluids through a cylinder. The equation states that the flow rate is directly proportional to the pressure driving the fluid and the fourth power of the radius. Additionally, it is inversely proportional to the viscosity of the fluid and the length of the tube. This means that a short, wide cannula with pressure on the bag will deliver fluids more rapidly than a long, narrow one.

      It is important to note that even small changes in the radius of a tube can greatly affect the flow rate. This is because the fourth power of the radius is used in the equation. Therefore, any changes in the radius will have a significant impact on the flow rate. Poiseuille’s equation is crucial in determining the optimal conditions for fluid delivery in medical settings.

    • This question is part of the following fields:

      • Basic Sciences
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  • Question 45 - A 32-year-old snowboarder presents to the Emergency department complaining of pain and swelling...

    Incorrect

    • A 32-year-old snowboarder presents to the Emergency department complaining of pain and swelling around the first metacarpophalangeal joint (MCP joint) following a fall during practice.
      Upon examination, there is significant swelling and bruising on the ulnar side of the joint.

      What is the most probable injury that the patient has sustained?

      Your Answer: Scaphoid bone

      Correct Answer: Ulnar collateral ligament

      Explanation:

      Skier’s Thumb: A Common Injury in Winter Sports

      Skier’s thumb, also known as gamekeeper’s thumb, is a common injury that occurs in winter sports. It is caused by damage or rupture of the ulnar collateral ligament, which is located at the base of the thumb. This injury can result in acute swelling and gross instability of the thumb. In severe cases where a complete tear of the ligament is suspected, an MRI may be necessary to confirm the diagnosis, and surgical repair may be required.

      Once the acute swelling has subsided, treatment for skier’s thumb typically involves immobilization in a thumb spica. This is the standard therapy for cases of partial rupture.

    • This question is part of the following fields:

      • Basic Sciences
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  • Question 46 - At what stage of meiosis does the process of homologous recombination occur? ...

    Incorrect

    • At what stage of meiosis does the process of homologous recombination occur?

      Your Answer: Interphase I

      Correct Answer: Prophase I

      Explanation:

      Homologous Recombination: A Mechanism for DNA Repair and Genetic Variation

      Homologous recombination is a process that allows for the exchange of nucleotide sequences between two similar or identical DNA molecules. This occurs during meiosis, specifically during the second phase of prophase I, where sister chromatids swap sequences. The primary purpose of homologous recombination is to accurately repair harmful double-strand DNA breaks. This process results in new combinations of DNA sequences that provide genetic variation in daughter cells and, ultimately, the organism’s offspring.

      In prokaryotic organisms such as bacteria and viruses, homologous recombination occurs during horizontal gene transfer. This process involves the exchange of genetic material between different strains and species. Homologous recombination plays a crucial role in the evolution of these organisms by allowing for the acquisition of new traits and adaptations.

      Overall, homologous recombination is a vital mechanism for DNA repair and genetic variation. It ensures the accuracy of DNA replication and contributes to the diversity of life on Earth.

    • This question is part of the following fields:

      • Basic Sciences
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  • Question 47 - While taking a patient's medical history, you discover that their family has a...

    Incorrect

    • While taking a patient's medical history, you discover that their family has a strong history of a certain disease. Autosomal dominant diseases are often caused by defects in structural genes and typically present in early adulthood, affecting both males and females equally. Which of the following diseases does not follow an autosomal dominant pattern of inheritance?

      Your Answer: Neurofibromatosis type 1

      Correct Answer: Haemochromatosis

      Explanation:

      Abnormal Binding Proteins and Iron Deposition: A Genetic Disorder

      Abnormal binding proteins can lead to the deposition of iron in the body, resulting in various health complications. This genetic disorder is inherited in an autosomal recessive manner. The deposition of iron can cause cardiomyopathy, cirrhosis, pancreatic failure due to fibrosis, and skin pigmentation.

      In general, disorders that affect metabolism or DNA replication on a cellular or genetic level tend to be autosomal recessive. On the other hand, genetic disorders that affect the structure of the body on a larger level are usually autosomal dominant. While there may be exceptions to these rules, they can serve as a helpful guide for exam preparation. Proper of this genetic disorder can aid in its diagnosis and management.

    • This question is part of the following fields:

      • Basic Sciences
      17.2
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  • Question 48 - A couple in their late 30s come to the clinic seeking information about...

    Incorrect

    • A couple in their late 30s come to the clinic seeking information about the risk of their three children inheriting Huntington's disease. The husband has recently been diagnosed with the disease, while the wife is not affected. What is the likelihood, expressed as a percentage, that their children will inherit the disease?

      Your Answer: 25%

      Correct Answer: 50%

      Explanation:

      Huntington’s Disease

      Huntington’s disease is a genetic disorder that typically appears later in life and is characterized by symptoms such as chorea, cognitive decline, and personality changes. It is an autosomal dominant disease, meaning that there is a 50% chance of passing it on to offspring. If the gene is inherited from an unaffected parent, the child will not be affected. This is different from autosomal recessive inheritance, where both parents must pass on the gene for it to affect their children.

      The disease is caused by an increase in the length of a repeating trinucleotide sequence (CAG) in the Huntington protein. This sequence can change in length through generations, and longer sequences are associated with earlier onset of symptoms (genetic anticipation). Since Huntington’s disease usually presents itself after people have already started their families, there are many issues associated with genetic testing.

    • This question is part of the following fields:

      • Basic Sciences
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  • Question 49 - What is the primary role of the nuclear membrane? ...

    Incorrect

    • What is the primary role of the nuclear membrane?

      Your Answer: To maintain the integrity of heterochromatin inside the nucleus

      Correct Answer: To regulate transport of molecules in and out of the nucleus

      Explanation:

      The Role of the Nucleus and Nuclear Envelope in Cell Function

      The nucleus is a crucial component of eukaryotic cells, serving as the control centre for the cell. It is characterised by a membrane-enclosed structure that contains the cell’s chromosomes and is heavily involved in regulating gene transcription and protein synthesis. The nuclear envelope, which consists of an outer and inner membrane, plays a critical role in regulating the movement of molecules in and out of the nucleus. This is achieved through nuclear pores on the surface of the envelope, which allow the passage of water-soluble molecules. While the incorrect answer options describe minor roles of the nuclear envelope, its primary function is to act as a regulatory barrier for anything that enters or exits the nucleus. Overall, the nucleus and nuclear envelope are essential components of cell function, playing a critical role in regulating gene expression and maintaining cellular homeostasis.

    • This question is part of the following fields:

      • Basic Sciences
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  • Question 50 - Which process occurs mainly in the smooth endoplasmic reticulum? ...

    Incorrect

    • Which process occurs mainly in the smooth endoplasmic reticulum?

      Your Answer: Transcription

      Correct Answer: Steroid synthesis

      Explanation:

      The Functions of Endoplasmic Reticulum and Lysosomes

      The endoplasmic reticulum (ER) is a complex network of membranes that is divided into two types: rough and smooth. The rough ER is characterized by the presence of ribosomes on its cytosolic side, which makes it an important site for protein production, modification, and transport. On the other hand, the smooth ER is involved in cholesterol and steroid handling, as well as calcium storage in some cells. This type of ER is particularly prominent in cells that produce large amounts of steroid hormones, such as those found in the adrenal cortex.

      Lysosomes, on the other hand, are organelles that are responsible for breaking down and recycling cellular waste. They are formed by the Golgi apparatus, which is another complex network of membranes found in eukaryotic cells. Lysosomes contain a variety of enzymes that are capable of breaking down different types of molecules, including proteins, lipids, and carbohydrates.

      In summary, the ER and lysosomes are two important organelles in eukaryotic cells that play different roles in cellular metabolism. While the ER is involved in protein production, modification, and transport, the lysosomes are responsible for breaking down and recycling cellular waste.

    • This question is part of the following fields:

      • Basic Sciences
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