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

    Correct

    • The p53 tumour suppressor gene is located on?

      Your 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
      2.3
      Seconds

  • Question 2 - 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
      2.1
      Seconds

  • Question 3 - Microtubule subunits include: ...

    Correct

    • Microtubule subunits include:

      Your Answer: Alpha and beta tubulin

      Explanation:

      Microtubules are long, hollow cylinders made up of polymerised α- and β-tubulin dimers.

    • This question is part of the following fields:

      • Cell Biology
      • Medicine
      3.3
      Seconds

  • Question 4 - In the presence of oxygen , lactate that was produced under anaerobic conditions...

    Correct

    • In the presence of oxygen , lactate that was produced under anaerobic conditions is converted to:

      Your Answer: Pyruvate

      Explanation:

      Lactate can be used in two ways:Oxidation back to pyruvate by well-oxygenated muscle cells, heart cells, and brain cells. Pyruvate is then directly used to fuel the Krebs cycle orConversion to glucose via gluconeogenesis in the liver and release back into circulation.

    • This question is part of the following fields:

      • Cell Biology
      • Medicine
      2.5
      Seconds

  • Question 5 - Changes in cadherin expression are associated with ...

    Correct

    • Changes in cadherin expression are associated with

      Your Answer: Tumour metastatic potential

      Explanation:

      Cadherins play a role in maintaining cell and tissue structure, and in cellular movement. The E-cadherin–catenin complex plays a key role in cellular adhesion; loss of this function has been associated with greater tumour metastasis.

    • This question is part of the following fields:

      • Cell Biology
      • Medicine
      4.2
      Seconds

  • Question 6 - Intermediate filaments achieve cell to cell contact via: ...

    Correct

    • Intermediate filaments achieve cell to cell contact via:

      Your Answer: Desmosomes

      Explanation:

      At the plasma membrane, some keratins interact with desmosomes (cell-cell adhesion) and hemidesmosomes (cell-matrix adhesion) via adapter proteins.

    • This question is part of the following fields:

      • Cell Biology
      • Medicine
      10.4
      Seconds

  • Question 7 - Mitosis is the process of cell division which culminates in cell chromosomes which...

    Correct

    • Mitosis is the process of cell division which culminates in cell chromosomes which are:

      Your Answer: Diploid

      Explanation:

      Mitosis is a part of the cell cycle when replicated chromosomes are separated into two new diploid nuclei.

    • This question is part of the following fields:

      • Cell Biology
      • Medicine
      3.9
      Seconds

  • Question 8 - With regards to the Na+/K+ ATPase, which one of the following is correct?...

    Incorrect

    • With regards to the Na+/K+ ATPase, which one of the following is correct?

      Your Answer: 2 K+ released into the extracellular fluid

      Correct Answer: 3 Na+ released into the extracellular fluid

      Explanation:

      Na+/K+ pump or sodium–potassium pump is an enzyme found in the plasma membrane. This pumping is active (i.e. it uses energy from ATP) and is important for cell physiology. Its simple function is to pump 3 sodium ions out for every 2 potassium ions taken in and since they both have equal ionic charges, this creates a electrochemical gradient between a cell and its exterior.

    • This question is part of the following fields:

      • Cell Biology
      • Medicine
      14.3
      Seconds

  • Question 9 - The interior of lysosomes is kept at a pH of around 5 by...

    Correct

    • The interior of lysosomes is kept at a pH of around 5 by the action of:

      Your Answer: H+ ATPase

      Explanation:

      The lysosome maintains its pH differential by pumping in protons (H+ ions) from the cytosol across the membrane via proton pumps and chloride ion channels. Vacuolar H+-ATPases are responsible for transport of protons, while the counter transport of chloride ions is performed by ClC-7 Cl−/H+ antiporter.

    • This question is part of the following fields:

      • Cell Biology
      • Medicine
      4.2
      Seconds

  • Question 10 - 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
      4.5
      Seconds

SESSION STATS - PERFORMANCE PER SPECIALTY

Cell Biology (9/10) 90%
Medicine (9/10) 90%
Passmed
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