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Question

During cell growth, DNA synthesis takes place in


A
G2 phase
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B
M pahse
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C
S phase
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D
G1 phase
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Solution

The correct option is A S phase
  • Interphase is the period between two subsequent M phases and consists of three phases: $$G_1$$, S phase (the period of DNA replication) and $$G_2$$ phase. 
  • The $$G_1$$ phase is the gap between M phase and S phase and is marked by synthesis of RNA and protein (excluding histones) and duplication of all cell content except DNA.
  • S phase of DNA replication and cell division is followed by $$G_2$$ phase during which cell double-checks the duplicated DNA content.
Therefore, the correct answer is option C.

Biology

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