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Question

In which of the following phase DNA / chromosome replication takes place?

A
G1-phase
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B
G2-phase
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C
S-phase
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D
Prophase
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Solution

The correct option is A S-phase
  • The cell cycle consists of 2 phases, the mitotic phase, and interphase.
  • The interphase is divided into the first growth phase (G1phase), synthesis phase (S phase) and second growth phase (G2 phase). G1 (Gap 1) is the phase where a large amount of protein synthesis occurs required for the DNA replication and the volume of the cytoplasm increases.
  • The S phase stands for the synthesis phase in which DNA replication occurs followed by synthesis of histones. G2 phase is a period of rapid cell growth and protein synthesis, during which the cell prepares itself for mitosis.
Thus, the correct answer is option C.

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