Chromosomes and Cell Cycle: Lecture 8 Quiz
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Questions and Answers

What is responsible for the division of preexisting cells in prokaryotic cells?

  • Mitosis
  • Meiosis
  • Cytokinesis
  • Binary fission (correct)
  • Which process is responsible for the division of the cytoplasm into two distinct daughter cells?

  • Meiosis
  • Binary fission
  • Mitosis
  • Cytokinesis (correct)
  • What is responsible for producing exact copies of genetic information in eukaryotic cells?

  • Cytokinesis
  • Mitosis (correct)
  • Meiosis
  • Binary fission
  • Which type of cell replication is responsible for growth, wound repair, and reproduction in eukaryotes?

    <p>Mitotic cell division</p> Signup and view all the answers

    In eukaryotic cells, what are responsible for one of the fundamental attributes of life, namely reproduction?

    <p>Mitotic and meiotic cell divisions</p> Signup and view all the answers

    What is the duration of the cell cycle in E. coli?

    <p>20 minutes</p> Signup and view all the answers

    What is the fundamental difference between meiosis and mitosis?

    <p>Meiosis leads to the production of gametes, while mitosis leads to the production of somatic cells</p> Signup and view all the answers

    What happens after chromosomes replicate in eukaryotic nuclei?

    <p>The two identical copies are attached to each other along their entire length</p> Signup and view all the answers

    What is a chromosome composed of in eukaryotic cells?

    <p>A single, long DNA double helix wrapped around proteins</p> Signup and view all the answers

    What is the basic unit of the eukaryotic chromosome characterized as?

    <p>A gigantic, linear, double-stranded DNA molecule complexed with proteins forming chromatin</p> Signup and view all the answers

    Which phase of the eukaryotic cell cycle involves DNA replication?

    <p>Synthesis (S) phase</p> Signup and view all the answers

    What does the G1 checkpoint in the cell cycle ensure?

    <p>Everything is ready for DNA synthesis</p> Signup and view all the answers

    What does the G0 phase of the cell cycle entail?

    <p>A temporary testing period where a cell will exit the cycle and quit dividing</p> Signup and view all the answers

    What is visible by light microscopy during interphase in terms of changes in the nucleus?

    <p>No dramatic changes are visible</p> Signup and view all the answers

    What are the outcomes of meiosis and mitosis respectively?

    <p>Meiosis: Production of gametes; Mitosis: Production of somatic cells</p> Signup and view all the answers

    Study Notes

    • Eukaryotic cells undergo mitosis and meiosis for cell division, accompanied by cytokinesis.
    • Mitosis produces somatic cells with identical genetic material, while meiosis leads to the creation of gametes with half the genetic material.
    • Chromosomes are long, double-stranded DNA molecules wrapped around histones and form chromatin.
    • After chromosome replication, chromatids are attached to each other by cohesins.
    • The eukaryotic cell cycle includes interphase (G1, S, and G2), mitosis (nuclear division), and cytokinesis (cytoplasmic division).
    • Interphase consists of G1 (cell growth), S (DNA synthesis), G2 (cell preparation), and G0 (cell exit from the cycle).
    • The G1 checkpoint ensures the cell is prepared for DNA synthesis during S phase.
    • Mitosis results in the formation of two identical daughter nuclei, while meiosis results in the production of four haploid daughter cells.
    • Cytokinesis divides the cytoplasm to create separate daughter cells.
    • Eukaryotic cells have different cell cycle durations, with mitosis taking approximately 2-4 hours and interphase taking 6-10 hours for some cells.
    • Prokaryotic cells divide via binary fission.
    • Each phase of the cell cycle plays a vital role in the overall process of cell replication and growth.

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    Test your understanding of the cell cycle, chromosome structure, mitosis, meiosis, and the control mechanisms involved in cell division.

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