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Cell Cycle and Cell Division Test - 68

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Cell Cycle and Cell Division Test - 68
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  • Question 1
    1 / -0
    Most organelles show duplication in cell cycle during 
    Solution
    A. During G1- phase, cells grow and synthesize the 20 amino acids needed to manufacture proteins later on.
    B. Cell cycle begins with the resting phase. During this phase, cells are at ''rest''.
    C. During S-phase DNA synthesis occurs.
    D. During this stage, organelles are replicated and proteins are synthesized.
    So. the correct answer is '$$G_2$$- phase".
  • Question 2
    1 / -0
    Chromatin fibers duplication, Genetic material- 4C, Histone Protein Synthesis, membranous organelle duplication, DNA replication, centriole duplication. How many of the above features are associated with the synthesis phase of the cell cycle? 
    Solution
    In S phase or Synthesis phase cell synthesizes a replica of the genome by the process known as DNA replication. It also includes synthesis of histone proteins and centriole duplication in the cytoplasm. Thus, the DNA content becomes doubled.
    So the correct option is 'Three'.
  • Question 3
    1 / -0
    ...................is the last phase of karyokinesis
    Solution
    • Karyokinesis is the process of division of the nucleus of a cell during cell division i.e mitosis or meiosis.
    • It has following phases-
    1. Prophase
    2. Metaphase
    3. Anaphase
    4. Telophase
    • Telophase is the last phase of karyokinesis.
    • The correct answer is OPTION C.
  • Question 4
    1 / -0
    If at the end of meiosis the 4 daughter cells produced have 20 chromosomes each, how many chromosomes would have been present in the mother cell from which these daughter cells are formed?
    Solution
    Since , we are aware about the fact that meiosis is a reductional division because number of chromosome gets reduced to half in daughter cell as compared to mother cell . Here, specified chromosome in daughter cell is 20 after meiosis thus, the mother cell was having double the number of chromosomes i.e., 40. 
    So, correct answer is option C.
  • Question 5
    1 / -0
    Suppose, you have supplied with onion root to observe steps in cell division. If you want to count the number of chromosomes, which step will you observe?
    Solution
    In order to count the number of chromosomes, the onion root should be observed in the metaphase of the cell division. During metaphase, the chromosomes shorten and condense. During this phase, the shape of chromosomes are distinct and visible under the light microscope
    So, the correct answer is 'Metaphase'

  • Question 6
    1 / -0
    Cells of which stage remains metabolically active but there is no longer proliferation?
    Solution
    • $$G_0$$ phase is also called a quiescent phase. 
    • At this phase, the cell remains metabolic active but there is no longer proliferation. 
    • It is a period of resting stage for a cell, where the cell is neither dividing nor preparing to divide and no longer proliferate unless called to do so depending on the requirement of the organism.
    • So the correct answer is '$$G_0$$ phase'.
  • Question 7
    1 / -0
    If DNA content of the somatic cell is 16pg in G1 phase, what would be the DNA content in each of the identical daughter cell?
    Solution
    The four cells each have half the chromosome number found in the somatic cell. 
    So, the correct option is '8pg'.
  • Question 8
    1 / -0
    DNA synthesis occurs in 
    Solution
    DNA replication occurs in the S phase of the cell cycle. During the S phase of the cell cycle, the DNA double helix is unwound by the enzyme helicase and every single helix is duplicated by the assembly of nucleotides by DNA polymerase.

    So, the correct answer is 'S-phase'.
  • Question 9
    1 / -0
    Meiosis occurs in
    Solution
    Meiosis is a type of cell division that results in four daughter cells, each with half the number of chromosomes of the parent cell, as in the production of gametes and plant spores. Meiosis starts with a diploid cell and produces four haploid cells. The starting diploid cell is usually known as germinal cell.
    So, the correct answer is 'Germinal cell'.
  • Question 10
    1 / -0
    Identify phase in mitosis shown by : centromeres split and thereby sister chromatids of each chromosome separates and they are pulled apart in opposite direction.
    Solution
    1. In Prophase, nuclear envelope degenerates and chromosome condenses.
    2. Metaphase is the stage where chromatids align themselves at the equatorial/metaphase plate.
    3. Anaphase is marked by splitting of centromeres followed by pulling of sister chromatids of each chromosome towards the opposite poles.
    4. Telophase is marked by sister chromatids reaching the opposite poles and the reformation of nuclear vesicles around it.
    So, the correct answer is "Telophase".
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