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  • Question 1 - The processing of NH3 to urea occurs in: ...

    Incorrect

    • The processing of NH3 to urea occurs in:

      Your Answer: Cytoplasm alone

      Correct Answer: Mitochondria and cytoplasm

      Explanation:

      The urea cycle (also known as the ornithine cycle) is a cycle of biochemical reactions that produces urea ((NH2)2CO) from ammonia (NH3). The urea cycle consists of four enzymatic reactions: one mitochondrial and three cytosolic.

    • This question is part of the following fields:

      • Cell Biology
      • Medicine
      2.1
      Seconds

  • Question 2 - Which is true of the citric acid cycle? ...

    Incorrect

    • Which is true of the citric acid cycle?

      Your Answer: Is the final common pathway for the reduction of fats, amino acids and carbohydrates

      Correct Answer: Involves a series of reactions where oxaloacetate is regenerated

      Explanation:

      The cycle consumes acetate (in the form of acetyl-CoA) and water, reduces NAD+ to NADH, and produces carbon dioxide as a waste by-product. The NADH generated by the citric acid cycle is fed into the oxidative phosphorylation (electron transport) pathway. At the end of each cycle, the four-carbon oxaloacetate has been regenerated, and the cycle continues. The net result of these two closely linked pathways is the oxidation of nutrients to produce usable chemical energy in the form of ATP. Acetyl-CoA, is the starting point for the citric acid cycle and in eukaryotic cells, the citric acid cycle occurs in the matrix of the mitochondrion. Though the Krebs cycle does not directly require oxygen, it can only take place when oxygen is present because it relies on by-products and is therefore an aerobic process.

    • This question is part of the following fields:

      • Cell Biology
      • Medicine
      4.3
      Seconds

  • Question 3 - Microtubule disassembly: ...

    Incorrect

    • Microtubule disassembly:

      Your Answer: Does not occur simultaneously with microtubule assembly.

      Correct Answer: Occurs at the positive and negative end

      Explanation:

      Dynamic instability refers to the coexistence of assembly and disassembly at the ends of a microtubule. The microtubule can dynamically switch between growing and shrinking phases in this region. Although both assembly and disassembly occur at both ends they occur preferentially at the (+) end.

    • This question is part of the following fields:

      • Cell Biology
      • Medicine
      1.3
      Seconds

  • Question 4 - In blistering dermatological disorders e.g.. Pemphigus, which junctions are attacked by autoantibodies? ...

    Incorrect

    • In blistering dermatological disorders e.g.. Pemphigus, which junctions are attacked by autoantibodies?

      Your Answer: Gap junctions

      Correct Answer: Desmosomes

      Explanation:

      Pemphigus is an autoimmune disease caused by antibodies directed against both desmoglein 1 and desmoglein 3 present in desmosomes. Loss of desmosomes results in loss of cohesion between keratinocytes in the epidermis, and a disruption of the barrier function served by intact skin. The process is classified as a type II hypersensitivity reaction

    • This question is part of the following fields:

      • Cell Biology
      • Medicine
      2.4
      Seconds

  • Question 5 - Which of the following statements is most suitable to describe necrosis? ...

    Incorrect

    • Which of the following statements is most suitable to describe necrosis?

      Your Answer: Tightly regulated involving activation and enzymatic steps.

      Correct Answer: Significant inflammatory response

      Explanation:

      Necrosis is the death of most or all of the cells in an organ or tissue due to disease, injury, or failure of the blood supply. Cellular death due to necrosis does not follow the (regulated) apoptotic signal transduction pathway, but rather various receptors are activated, and result in the loss of cell membrane integrity and an uncontrolled release of products of cell death into the extracellular space. This initiates in the surrounding tissue an inflammatory response which attracts leukocytes and nearby phagocytes which eliminate the dead cells by phagocytosis.

    • This question is part of the following fields:

      • Cell Biology
      • Medicine
      1.4
      Seconds

  • Question 6 - The complete oxidation of 1 molecule of glucose to CO2 and H20 produces...

    Incorrect

    • The complete oxidation of 1 molecule of glucose to CO2 and H20 produces a total of __ATP.

      Your Answer:

      Correct Answer: 38

      Explanation:

      Textbooks often state that 38 ATP molecules can be made per oxidised glucose molecule during cellular respiration (2 from glycolysis, 2 from the Krebs cycle, and about 34 from the electron transport system). However, this maximum yield is never quite reached because of losses due to leaky membranes as well as the cost of moving pyruvate and ADP into the mitochondrial matrix, and current estimates range around 29 to 30 ATP per glucose.

    • This question is part of the following fields:

      • Cell Biology
      • Medicine
      0
      Seconds

SESSION STATS - PERFORMANCE PER SPECIALTY

Cell Biology (5/5) 100%
Medicine (5/5) 100%
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