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Cell Cycle and Cell Division Test - 28

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Cell Cycle and Cell Division Test - 28
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  • Question 1
    1 / -0
    The replication of DNA in meiosis occur during 
    Solution
    The replication of DNA in meiosis occur during S phase. S phase or the synthesis phase is the part of the cell cycle in which DNA is replicated, occurring between G$$_1$$ phase and G$$_2$$ phase. S Phase occurs to produce two similar daughter cells, the complete DNA instructions in the cell must be duplicated. DNA replication occurs during this S or synthesis phase.
    So, the correct answer is option A.
  • Question 2
    1 / -0
    The chromosome exhibit high level of coiling at which phase of karyokinesis?
    Solution
    Chromosome exhibits a high level of coiling at metaphase. Metaphase is a stage of mitosis in the eukaryotic cell cycle in which chromosomes are at their most condensed and coiled stage. These chromosomes, carrying genetic information, align in the equator of the cell before being separated into each of the two daughter cells. 
    So, the correct answer is option B.
  • Question 3
    1 / -0
    The nuclear envelope reappears at which of the following phase?
    Solution
    The nuclear envelope reappears at telophase. During telophase, the effects of prophase and prometaphase are that the nuclear membrane and nucleolus disintegrating are reversed. Two daughter nuclei form in each daughter cell.
    So, the correct answer is option D.
  • Question 4
    1 / -0
    The meiosis takes place in 
    Solution
    Meiosis takes place in reproductive cells. Meiosis results in four haploid daughter cells by undergoing one round of DNA replication followed by two divisions: homologous chromosomes are separated in the first division, and sister chromatids are separated in the second division. Meiosis produces haploid gametes with one set of 23 chromosomes. When two gametes fuse, the resulting zygote is once again diploid.
    So, the correct answer is option C.
  • Question 5
    1 / -0
    A cell is bound to divide, if it has entered 
    Solution
    If a cell enters S phase it is bound to divide as because DNA starts  replicating. It occurs between G$$_1$$ phase and G$$_2$$ phase. DNA replication is necessary to prevent genetic abnormalities which often lead to cell death or disease.
    So, the correct answer is option D.
  • Question 6
    1 / -0
    Number of meiosis required to produce 100 megaspore in angiosperms are
    Solution
    A megaspore mother cell or megasporocyte is a diploid cell in plants in which meiosis will occur, resulting in the production of four megaspores. Generally, within each sporangium, meiosis of a megaspore mother cell produced four haploid megaspores, In gymnosperms and angiosperms, only one of these four megaspores is functional at maturity and the other three degenerate. So, one megaspore mother cell upon meiosis gives one viable megaspore.
    So, the correct answer is option B
  • Question 7
    1 / -0
    Which of the two events together restore the normal number of chromosomes in life cycle?
    Solution
    Meiosis and fertilization restore the normal number of chromosomes in the life cycle. Meiosis produces haploid gametes with one set of 23 chromosomes. When two gametes fuse, the resulting zygote is once again diploid, with the mother and father each contributing 23 chromosomes. 
    So, the correct answer is option B.
  • Question 8
    1 / -0
    In which stage of cell division, number of chromosomes is best counted?
    Solution
    The number of chromosomes is best counted during metaphase. In metaphase, the centromeres of the chromosomes convene themselves on the metaphase plate an imaginary line that is equidistant from the two centrosome poles. This even alignment is due to the counterbalance of the pulling powers generated by the opposing kinetochore microtubules, analogous to a tug-of-war between two people of equal strength.
    So, the correct answer is option B.
  • Question 9
    1 / -0
    The division of nucleus is indirect in
    Solution
    The division of nucleus is indirect in both mitosis and meiosis. Cell division is the process by which a parent cell divides into two or more daughter cells. There are two distinct types of cell division they are a vegetative division, which produces each daughter cell which is genetically identical to the parent cell (mitosis), and a reductive cell division, where the number of chromosomes in the daughter cells is reduced by half, to produce haploid gametes (meiosis). 
    Amitosis involves the direct division of nucleus without the spindle fiber formation.
    So, the correct answer is option D.
  • Question 10
    1 / -0
    The colchicine, a mitotic poison, arrests the cell division in which of the following phase?
    Solution
    • Colchicine is a mitotic inhibitor. A mitotic inhibitor is a drug that inhibits mitosis or cell division. 
    • Colchicine prevents spindle formation which occurs during the metaphase stage of cell division.
    So, the correct answer is option D.
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