Prokaryotic Cell Division Processes
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Prokaryotic Cell Division Processes

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Questions and Answers

What is the initial step in bacterial cytokinesis?

  • Recruitment of cell division proteins
  • Contracting of the FtsZ ring
  • Distribution of FtsZ throughout the cytoplasm (correct)
  • Formation of DNA replication forks

    • Which protein forms a ring on the inner surface of the cytoplasmic membrane during bacterial cytokinesis?

  • FtsA
  • MreB
  • ZipA
  • FtsZ (correct)

    • When does the FtsZ ring contract during bacterial cytokinesis?

  • After DNA replication (correct)
  • During DNA replication
  • Simultaneously with DNA replication
  • Before DNA replication

    • What does the theta structure represent in prokaryotic DNA replication?

    <p>Bidirectional replication</p> Signup and view all the answers

    Why can some rapidly growing bacterial cells end up without DNA?

    <p>The DNA replication time is shorter than the cell cycle time</p> Signup and view all the answers

    What induces FtsZ filamentation in bacterial cytokinesis?

    <p>Cell-cycle cue</p> Signup and view all the answers

    Which organelle is responsible for the nucleation of both nuclear and cytoplasmic microtubules in budding yeast?

    <p>Spindle pole body (SPB)</p> Signup and view all the answers

    In which type of organisms does the nuclear envelope remain intact throughout mitosis?

    <p>Unicellular organisms</p> Signup and view all the answers

    What is the main role of Golgi-derived vesicles in cell division?

    <p>Transport of cell wall material</p> Signup and view all the answers

    Which term describes the early embryonic cycles that involve division without growth?

    <p>Cycles without growth</p> Signup and view all the answers

    What is the characteristic difference between the cell division of somatic cells and early embryonic cycles?

    <p>Division with growth</p> Signup and view all the answers

    Why does the nuclear envelope need to break down in open mitosis?

    <p>To allow spindle access to chromosomes</p> Signup and view all the answers

    What is the role of cohesin in the cell cycle?

    <p>Prevents separation of sister chromatids</p> Signup and view all the answers

    Which structure is responsible for encircling loops of DNA and compressing sister chromatids during chromosome condensation?

    <p>Condensin</p> Signup and view all the answers

    Why is it crucial for the nuclear membrane to breakdown early in mitosis?

    <p>To allow the spindle to access the chromosomes</p> Signup and view all the answers

    Which event marks the beginning of mitosis?

    <p>Chromosome condensation</p> Signup and view all the answers

    What is the main function of the kinetochore during mitosis?

    <p>Attaches to the centromere of chromosomes</p> Signup and view all the answers

    How does condensin contribute to chromosome structure during cell division?

    <p>Encircles DNA loops and compresses sister chromatids</p> Signup and view all the answers

    What is the process known as when DNA replication is initiated before completion of the previous round?

    <p>Multifork replication</p> Signup and view all the answers

    Why is multifork replication essential in ensuring successful completion of at least one round of replication before cytokinesis?

    <p>To ensure faithful segregation of chromosomes</p> Signup and view all the answers

    Which phase of the eukaryotic cell cycle involves growth, doubling the mass of organelles, and synthesis of enzymes for DNA replication?

    <p>G1 phase</p> Signup and view all the answers

    What happens in the G0 phase of the cell cycle?

    <p>Terminally differentiated cells never divide again</p> Signup and view all the answers

    Why is it crucial for liver cells to exit G0 and enter the cell cycle when new liver cells are needed?

    <p>To ensure the liver can regenerate when damaged</p> Signup and view all the answers

    Which phase of the eukaryotic cell cycle involves chromosome duplication?

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

    What must mother cells do to ensure asymmetric cell division?

    <p>Segregate cell fate determinants and position the plane of division</p> Signup and view all the answers

    What is a characteristic of stem cell division in relation to niche cells?

    <p>Blocks differentiation but allows cell division</p> Signup and view all the answers

    What is a key feature of density-dependent inhibition in cell division?

    <p>Inhibits cell division once cells contact each other</p> Signup and view all the answers

    What is the role of P granule segregation in the development of Caenorhabditis elegans?

    <p>Drives formation of germ cells through RNA-protein complex</p> Signup and view all the answers

    How many cells are there in an adult hermaphrodite of Caenorhabditis elegans?

    <p>959</p> Signup and view all the answers

    What is an essential requirement for many animal cells to divide, according to the text?

    <p>Attachment to a substratum</p> Signup and view all the answers

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