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  • Question 1 - The p53 tumour suppressor gene is located on? ...

    Incorrect

    • The p53 tumour suppressor gene is located on?

      Your Answer: Chromosome 21

      Correct Answer: Chromosome 17

      Explanation:

      P53 is classified as a tumour suppressor gene and is located on the short arm of chromosome 17.

    • This question is part of the following fields:

      • Cell Biology
      • Medicine
      9.5
      Seconds

  • Question 2 - Which one of the following is able to move across cell membranes by...

    Correct

    • Which one of the following is able to move across cell membranes by passive diffusion?

      Your Answer: CO2

      Explanation:

      The cell membrane is permeable to water molecules and a few other small, uncharged, molecules like oxygen (O2) and carbon dioxide (CO2). Larger molecules like glucose or charged ions are unable to cross passively.

    • This question is part of the following fields:

      • Cell Biology
      • Medicine
      10.4
      Seconds

  • Question 3 - With regard to cell membrane proteins: ...

    Correct

    • With regard to cell membrane proteins:

      Your Answer: Carriers are involved in facilitated diffusion

      Explanation:

      Pumps use a source of free energy such as ATP to transport ions against a gradient and is an example of active transport. Unlike channel proteins which only transport substances through membranes passively, carrier proteins can transport ions and molecules either passively through facilitated diffusion, or via secondary active transport. Channels are either in open state or closed state. When a channel is opened, it is open to both extracellular and intracellular. Pores are continuously open to both environments, because they do not undergo conformational changes. They are always open and active.

    • This question is part of the following fields:

      • Cell Biology
      • Medicine
      25.5
      Seconds

  • Question 4 - The complete oxidation of 1 molecule of glucose to CO2 and H20 produces...

    Correct

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

      Your 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
      6.3
      Seconds

  • Question 5 - What is the function of gap junctions? ...

    Correct

    • What is the function of gap junctions?

      Your Answer: Diffusion of small molecules between neighbouring cells

      Explanation:

      Gap junctions are a specialized intercellular connection between a multitude of cell-types. They directly connect the cytoplasm of two cells, which allows various molecules, ions and electrical impulses to directly pass through a regulated gate between cells.

    • This question is part of the following fields:

      • Cell Biology
      • Medicine
      7.4
      Seconds

  • Question 6 - What is the function of secondary messengers? ...

    Correct

    • What is the function of secondary messengers?

      Your Answer: Communication from extracellular to intracellular signalling pathways

      Explanation:

      First messengers may not physically cross the phospholipid bilayer to initiate changes within the cell directly. This functional limitation necessitates the cell to devise signal transduction mechanisms to transduce first messenger into second messengers, so that the extracellular signal may be propagated intracellularly. Second messengers are intracellular signalling molecules released by the cell to trigger physiological changes such as proliferation, differentiation, migration, survival, and apoptosis. Secondary messengers are therefore one of the initiating components of intracellular signal transduction cascades.

    • This question is part of the following fields:

      • Cell Biology
      • Medicine
      16.6
      Seconds

SESSION STATS - PERFORMANCE PER SPECIALTY

Cell Biology (5/6) 83%
Medicine (5/6) 83%
Passmed
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