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Cell Cycle and Cell Division Test - 73

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Cell Cycle and Cell Division Test - 73
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  • Question 1
    1 / -0
    Centrioles moves to opposite pole in 
  • Question 2
    1 / -0
    How many meiosis are required to produced $$200$$ microspores or pollen grains?
    Solution
    During sexual reproduction in angiosperms, meiosis occurs in microspore and megaspore mother cells. Microspore mother cell is a diploid cell which after meiosis forms a tetrad of microspores, all of which are functional and produce four microspores or pollen grains. Hence, to produce 200 pollen grains, 50 meiotic divisions are required in 50 microspore mother cells.
    So, the correct answer is '50'

  • Question 3
    1 / -0
    How many meiosis are required to produce $$200$$ microspores or pollen grains?
    Solution
    Microspore mother cell is a diploid cell which after meiosis forms a tetrad of microspores, all of which are functional and produce four microspores or pollen grains. Hence, to produce 200 pollen grains, 50 meiotic divisions are required in 50 microspore mother cells.
     Hence, the correct answer is 50
  • Question 4
    1 / -0
    The sequence of events by which a cell duplicates its genome, synthesize the other constituents of the cell and eventually divides into two daughter cells is known as?
    Solution
    • During cell cycle a cell duplicates all of its contents, including its chromosomes, and splits to form two identical daughter cells. All other constituents of cell can also be synthesized during this phase.
    So the correct answer is option D.
  • Question 5
    1 / -0
    Which of the following is/are synthesized during $$G_2$$ phase of cell cycle?
    Solution
    • During the second growth phase or $$G_2$$ phase, the cell grows in size, makes more proteins and organelles, and simultaneously reorganizes its contents in preparation for mitosis. 
    • The microtubules that will be used to mobilize the chromosomes in anaphase are assembled at $$G_2$$ phase. 
    • $$G_2$$ phase ends when mitosis begins.

    Hence the correct answer is option D
  • Question 6
    1 / -0
    The most dramatic period of the cell cycle involving a major reorganisation of virtually all components of the cell is?
    Solution
    The time or duration exists from formation of cell to division of cell is called cell cycle. It includes two major phases, interphase and M-phase.
    Mitotic or M-phase is the most dramatic period of the cell cycle is involves in major reorganisation of virtually all components of the cell.
    So, the correct option is 'M-phase'.
  • Question 7
    1 / -0
    What would be the DNA content in a diploid cell at prophase-I, if its male gamete has $$40$$ pg DNA?
    Solution
    D. 160 pg
    Solution : The DNA content in a diploid cell would be double of the haploid male gamete. So the diploid cell just before meiosis during prophase I would have 160 pg because the diploid cell would have doubled its DNA before the M phase.
    So the correct answer is " 160 pg".
  • Question 8
    1 / -0
    Synthesis of macromolecules for the formation of cell organelles occurs in?
    Solution
    G1 (Gap 1), in which the cell grows and functions normally. During this time, a high amount of protein synthesis occurs and the cell grows (to about double its original size) - more organelles are produced and the volume of the cytoplasm increases. If the cell is not to divide again, it will enter G0.
    So, the correct option is option A. 
  • Question 9
    1 / -0
    From the following, identify the two correct statements with reference to meiosis.
    I. Bead like structure are absent on chromosome
    II. Displacement of chiasmata occur in diakinesis
    III. Separation of two basic sets of chromosomes
    IV. No division of centromere.
  • Question 10
    1 / -0
    In meiosis, actual haploidy in terms of DNA amount comes after?
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