Understanding Prophase in Mitosis
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Questions and Answers

In mitotic anaphase, what happens to the centromere and chromatids?

  • Centromere remains intact, chromatids separate (correct)
  • Centromere splits, chromatids remain together
  • Centromere splits, chromatids move closer
  • Both centromere and chromatids remain intact
  • During metaphase, how many spindle fibers join a single chromosome from one pole?

  • Two
  • Four
  • One (correct)
  • Three
  • What is the relationship between the length of mitotic anaphase and the other phases of mitosis?

  • Anaphase is of equal length to metaphase
  • Anaphase is the longest phase (correct)
  • Anaphase is the shortest phase
  • Anaphase duration varies in each mitosis
  • If Anaphase Promoting Complex (APC) is defective in a human cell, what is expected to occur during mitosis?

    <p>Chromosome non-segregation</p> Signup and view all the answers

    What happens immediately before the reformation of the nuclear envelope during the M phase of the cell cycle?

    <p>Chromosome separation in anaphase</p> Signup and view all the answers

    Which phase contains chromosomes with half the number of chromatids compared to metaphase?

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

    Which stage of the cell cycle is characterized by the initiation of DNA replication?

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

    What is the distinctive feature of the Diakinesis stage in meiotic prophase?

    <p>Terminalization of chiasmata</p> Signup and view all the answers

    During which phase does the centriole undergo duplication?

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

    In the context of meiosis, what event is associated with the Pachytene stage?

    <p>Crossing over</p> Signup and view all the answers

    When does the attachment of spindle fibers to kinetochores become evident during cell division?

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

    At which point do some dividing cells exit the cell cycle and enter the quiescent stage (G0) in the cell cycle?

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

    What is the main characteristic of Prophase in mitosis?

    <p>Initiation of condensation of chromosomal material</p> Signup and view all the answers

    During Prophase in mitosis, what happens to the Golgi complex, ER, nucleolus, and nuclear envelope?

    <p>They disappear completely</p> Signup and view all the answers

    What is a key feature of chromosomes during Prophase?

    <p>They have single chromatids</p> Signup and view all the answers

    Why is the initiation of assembly of the mitotic spindle significant in Prophase?

    <p>It is essential for chromosome condensation</p> Signup and view all the answers

    What occurs at the start of Metaphase in mitosis?

    <p>Chromosomes align at the cell equator</p> Signup and view all the answers

    Which structure do spindle fibers attach to during metaphase in mitosis?

    <p>Kinetochore of chromosomes</p> Signup and view all the answers

    Which statement accurately describes the process of meiosis?

    <p>Meiosis ensures the conservation of a specific chromosome number in sexually reproducing organisms.</p> Signup and view all the answers

    What happens during anaphase 2 of meiosis?

    <p>Sister chromatids do not separate.</p> Signup and view all the answers

    Which of the following is an accurate comparison between mitosis and meiosis?

    <p>Meiosis forms gametes, whereas mitosis forms somatic cells.</p> Signup and view all the answers

    In cell division, which stage is correctly matched with its characteristics?

    <p>Telophase - chromosomes move away and Golgi complex not present</p> Signup and view all the answers

    How many meiotic divisions are necessary to form 100 pollen grains from microspore mother cells?

    <p>50</p> Signup and view all the answers

    If a diploid cell at anaphase-I has 10 pg DNA in its egg cell, what would be the DNA content in the diploid cell?

    <p>$20$ pg</p> Signup and view all the answers

    What is expected to occur if Anaphase promoting complex (APC) is defective in a human cell?

    <p>Chromosomes will not segregate</p> Signup and view all the answers

    Which sequence of events correctly represents the stages during mitosis?

    <p>Condensation → Nuclear membrane disassembly → Arrangement at equator → Centromere division → Segregation → Telophase</p> Signup and view all the answers

    When does DNA replication occur in bacteria?

    <p>Prior to fission</p> Signup and view all the answers

    Which statement is correct regarding the cell cycle?

    <p>A cell in G1 phase has double the amount of DNA than a cell in G2 phase</p> Signup and view all the answers

    When are homologous chromosomes separated during meiosis?

    <p>Prophase I</p> Signup and view all the answers

    Which of the following is NOT an expected consequence of APC malfunction in a human cell?

    <p>Enhanced chromosome condensation</p> Signup and view all the answers

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