Cell Division and Regulation Quiz
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Questions and Answers

What initiates the cell cycle in a cell?

  • TGF-b receptors
  • Damaged DNA
  • Cell metabolism monitors
  • Growth factors (correct)
  • Which phase of the cell cycle follows the S-phase and precedes mitosis?

  • M-phase
  • G1
  • R-point
  • G2 (correct)
  • What is the main goal of mitosis in a cell?

  • Replicating the genome
  • Preparation for cell division
  • Even distribution of genomic material (correct)
  • Activation of growth factors
  • In which phase of the cell cycle do all the chromosomes become visible?

    <p>M-phase</p> Signup and view all the answers

    Why is it crucial for cells to stick to the order of events in the cell cycle?

    <p>To prevent 4n cells after 2 rounds of replication</p> Signup and view all the answers

    What ensures that cells maintain the order of events in the cell cycle?

    <p>Mechanism in place</p> Signup and view all the answers

    What is the consequence of a plant alkaloid binding to tubulin dimers during cell division?

    <p>Continued disassembly</p> Signup and view all the answers

    Which type of cancer is commonly associated with high expression of estrogen receptors?

    <p>Breast cancer</p> Signup and view all the answers

    In the context of anti-cancer drugs, what is the mechanism of action of tamoxifen?

    <p>Binds to estrogen receptors</p> Signup and view all the answers

    How do leuprolide and goserelin contribute to cancer treatment?

    <p>Cease testosterone production</p> Signup and view all the answers

    What is the significance of using anti-cancer drugs with different modes of action in combination?

    <p>Enhances treatment effectiveness</p> Signup and view all the answers

    Why is it important for microtubules not to remain attached to chromosomes after cell division is complete?

    <p>Ensures accurate chromosome segregation</p> Signup and view all the answers

    What is the function of CDK (cyclin-dependent kinase) in the cell cycle?

    <p>Blocks replication of DNA during S-phase</p> Signup and view all the answers

    What is the role of CKI (inhibitor protein) in the cell cycle?

    <p>Binds to and inhibits CDK function</p> Signup and view all the answers

    Which step ensures the activation of CDK in the cell cycle?

    <p>Cyclin phosphorylation</p> Signup and view all the answers

    What happens if there is an error in the cell cycle process?

    <p>Binding of CKI to CDK</p> Signup and view all the answers

    How is cyclin CDK complex activity regulated at the start of the cell cycle?

    <p>Presence of phosphates blocking CDK activity</p> Signup and view all the answers

    What distinguishes the cell cycle regulation mechanism in humans from simple organisms?

    <p>Presence of multiple cyclins and CDKs in humans</p> Signup and view all the answers

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