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Question

The interval between mitosis and initiation of DNA replication represents: 
  1. Gap 1 phase
  2. Quiescent phase
  3. Synthesis phase
  4. Gap 2 phase


Solution

The correct option is A Gap 1 phase
Interphase is the most active stage of the cell cycle where there is cell growth and DNA replication. It is divided into three stages - G1 phase, S phase and G2 phase.

G1 phase is the interval between mitosis and initiation of DNA replication. During this phase, the cell does not synthesize or replicate DNA but remains metabolically active.

S phase is a phase in which synthesis or replication of DNA takes place. 

G2 phase is the second gap phase present between S and M phase.  

G0 phase is a period in the cell cycle in which cells that do not divide exit from the cell cycle and enter into a quiescent state (non-dividing phase). 

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