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Cell Cycle and Cell Division Test - 76

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Cell Cycle and Cell Division Test - 76
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  • Question 1
    1 / -0
    Synapsis occurs during which phase ?
    Solution
    synapsis is the pairing of two homologous chromosomes that occurs during meiosis. Synapsis takes place during prophase I of meiosis.
    So, the correct answer is 'prophase I'
  • Question 2
    1 / -0
    Which one is correct for $$G_0$$ stage?
    (i) It is a quiescent stage.
    (ii) In this phase cell cycle is stopped.
    (iii) $$G_0$$ cells do not grow or proliferate but metabolically active.
    (iv) $$G_0$$ cells can divide in response to some stimulus.
    Solution
    • The G$$_0$$ phase or resting phase is a period in the cell cycle in which cells exist in a quiescent state. 
    • G$$_0$$ phase is viewed as either an extended G$$_1$$ phase, where the cell is neither dividing nor preparing to divide or a distinct quiescent stage that occurs outside of the cell cycle. 
    • Some types of cells, such as nerve and heart muscle cells, become quiescent when they reach maturity (i.e., when they are terminally differentiated) but continue to perform their main functions for the rest of the organism's life.
    • Cells remain in the G$$_0$$ phase until they receive any stimulus to divide. Some cell types in mature organisms, such as parenchymal cells of the liver and kidney, enter the G$$_0$$ phase semi-permanently and can be induced to begin dividing again only under very specific circumstances.
    So, the correct answer is option A.
  • Question 3
    1 / -0
    From a culture of mammalian cells, a cell in M phase is made to fuse with a second cell in G1 phase. The second cell go into ________________.
    Solution
    In S phase (synthetic phase) the chromosomes replicate. For this their DNA molecules function as templates and form carbon copies. The DNA content doubles i.e., 1C to 2C for haploid cells and 2C to 4C for diploid cells.
    S-phase is also called invisible phase of M-stage since it is in this phase that chromosome prepare themselves for equitable distribution later on.
  • Question 4
    1 / -0
    In case a protease is added during Prophase I of meiosis I which of the following processes are not likely to occur
    Solution
    Synatonemal complex is a protein complex that holds a pair of homologous chromosomes together during the sub phases of Prophase I of Meiosis I
    In case a protease is added the complex is digested therefore no pairing and recombination will take place
    So, the correct answer is 'Both A and B'
  • Question 5
    1 / -0
    In mitosis the pressure on centromere will be more during?
  • Question 6
    1 / -0
    Meiosis in diploid organisms results in
    Solution
    Meiosis results in reduction of number of chromosomes and gametes are formed only after meiosis. Crossing over during meiosis leads to variations. Hence, all the options are correct. 
  • Question 7
    1 / -0
    Why does cell division occur?
    Solution
    New cells are formed in organisms in order to grow, to replace old, dead and injured cells, and to form gametes required for reproduction. The process by which new cells are made is called cell division.
    Hence the correct option is E.
  • Question 8
    1 / -0
    The number of daughter cells formed after meiosis is
    Solution
    Specific cells of reproductive organs or tissues in animals and plants divide to form gametes, which after fertilisation give rise to offspring. They divide by a different process called meiosis which involves two consecutive divisions. When a cell divides by meiosis it produces four new cells instead of just two. The new cells only have half the number of chromosomes than that of the mother cells.
    Hence the correct option is C.
  • Question 9
    1 / -0
    If the mother cell cell has 24 chromosomes, the 2 daughter cells formed after mitosis will have ______ chromosomes.
    Solution
    The process of cell division by which most of the cells divide for growth is called mitosis. In this process, each cell called mother cell divides to form two identical daughter cells. The daughter cells have the same number of chromosomes as mother cell.
    Hence the correct option is B.
  • Question 10
    1 / -0
    Why does a cell divide?
    Solution
    New cells are formed in organisms in order to grow, replace old, dead, and injured cells, and form gametes required for reproduction. The process by which new cells are made is called cell division.
    Hence, the correct option is E.
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