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Cell Cycle and Cell Division Test - 29

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Cell Cycle and Cell Division Test - 29
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  • Question 1
    1 / -0
    The interzonal fibers occur in 
    Solution
    In the last anaphase, the zone between the two sets of chromosomes or the equatorial region gradually increases.The movement (and separation) of the chromosome is controlled by spindle fibres, which stretch and form interzonal fibres. A band of ‘interzonal fibres’ is often seen for a time after the separation has been accomplished, connecting the chromosomes which have pulled apart and often including a remnant of the spindle.

    So, the correct answer is 'D'.

  • Question 2
    1 / -0
    Cell cycle can remain arrested in which of the following stages?
    Solution
    Cell cycle can remain arrested at G$$_1$$ phase, During G$$_1$$ phase a diploid cell contains the amount of DNA equal to a tetraploid cell. During G$$_1$$ phase, the cell grows in size and synthesises mRNA and proteins that are required for DNA synthesis. 
    Once the required proteins and growth are complete, the cell enters the next phase of the cell cycle, S phase. The duration of each phase, including the G$$_1$$ phase, is different in many different types of cells. G$$_1$$ phase is particularly important in the cell cycle because it determines whether a cell commits to the division or to leaving the cell cycle. If a cell is signalled to remain undivided, instead of moving onto the S phase, it will leave the G$$_1$$ phase and move into a state of dormancy called the G$$_0$$ phase.
    So, the correct answer is option A.
  • Question 3
    1 / -0
    During cell division, chromosome move towards different poles due to
    Solution
    During cell division chromosome move towards different poles due to microtubules. Microtubules are found at kinetochores and used to pull chromatids apart during mitosis. In polarized interphase cells, microtubules are disproportionately oriented from the MTOC toward the site of polarity, such as the leading edge of migrating fibroblasts.
    So, the correct answer is option C.
  • Question 4
    1 / -0
    The spindle fibers which extend from pole to kinetochores are
    Solution
    The spindle fibres that are continuous from one pole to another pole of the cell are termed as continuous fibres while those extending from centromere of the chromosome to the pole are called as chromosomal spindle fibres. The spindle fibres present between centromeres of separating chromatids is termed in interzonal fibres. Microtubules that spread out from the centrosome in the opposite direction from the spindle itself are collectively termed as astral rays. So, the correct answer is option A.
  • Question 5
    1 / -0
    The metabolism of cell decreases during prophase again increases during which of the following phase?
    Solution
    At the onset of telophase, the metabolic rate increases due to the formation of new daughter cell. The nuclear membrane and nucleolus reappear. The number of organelles increases which leads to increase in the metabolic activity.
    So, the correct answer is option A.
  • Question 6
    1 / -0
    .............. stage of cell division occurs after G$$_2$$ phase.
    Solution
    Prophase follows the G$$_2$$ phase. The cell cycle is an ordered set of events, culminating in cell growth and division into two daughter cells. The stage are G$$_1$$-S-G$$_2$$-M. The cell enters into prophase which is the first stage of mitosis after G$$_2$$ phase.
    So, the correct answer is option A.
  • Question 7
    1 / -0
    Germ cells in vertebrate gonads are produced by
    Solution
    Germ cells in vertebrate gonads are produced by mitosis and meiosis. The cells divides mitotically to produce diploid cells. The diploid cells undergo meiosis to produce haploid gametes.
    So, the correct answer is option C.
  • Question 8
    1 / -0
    Which among the following is the longest phase of cell cycle?
    Solution
    The cell cycle is an ordered set of events, culminating in cell growth and division into two daughter cells. The stage is G$$_1$$-S-G$$_2$$-M. Protein and RNA are synthesized during G$$_1$$ phase which is used for DNA synthesis in the S phase.Therefore, the longest phase is the G$$_1$$ phase and lasts for about 11 hrs in a cycle that is completed in 24 hrs.
    So, the correct answer is option A.
  • Question 9
    1 / -0
    The gap between division phase and start of DNA replication is called as 
    Solution
    The cell cycle is an ordered set of events, culminating in cell growth and division into two daughter cells. The stage is G11-S-G22-M. Protein and RNA are synthesized during G$$_1$$ phase which is used for DNA synthesis in the S phase.
    So, the correct answer is option A.
  • Question 10
    1 / -0
    In mitosis, splitting of chromatids up to the centromere takes place in
    Solution
    The anaphase is marked by division of centromere and contraction of spindle fibers which in turn cause splitting of chromosome and movement of sister chromatids towards the opposite poles.
    so, the correct answer is option C.
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