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Match the following phases of the cell cycle with their descriptions: A. G1 phase B. S phase C. G2 phase D. M phase Descriptions: I. Cell division occurs II. Cell growth and normal metabolic roles III

Biology

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Here's the breakdown of the cell cycle phases and their corresponding activities:

  1. Match G1_{1} phase.

    The G1_{1} phase (Gap 1) is a period of cell growth and normal metabolic roles. The cell is metabolically active and continuously grows, but DNA replication does not occur. This matches description II.

    • A - II
  2. Match S phase.

    The S phase (Synthesis phase) is when DNA replication occurs. During this phase, the amount of DNA in the cell doubles. This matches description III.

    • B - III
  3. Match G2_{2} phase.

    The G2_{2} phase (Gap 2) is a period of further growth and preparation for cell division. Protein synthesis continues, and the cell grows, preparing for mitosis. This matches description IV.

    • C - IV
  4. Match M phase.

    The M phase (Mitotic phase) is the actual cell division phase, which includes both mitosis (nuclear division) and cytokinesis (cytoplasmic division). This matches description I.

    • D - I
  5. Combine the matches and select the correct option.

    The correct matching is A-II, B-III, C-IV, D-I.
    Comparing this with the given options:
    (1) A-III, B-IV, C-I, D-II
    (2) A-IV, B-I, C-II, D-III
    (3) A-I, B-II, C-III, D-IV
    (4) A-II, B-III, C-IV, D-I

    Option (4) is the correct match.

    The final answer is 4\boxed{\text{4}}

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