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DNA replication occurs during _________________ of the cell cycle.

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DNA replication occurs during _________________ of the cell cycle.

(a) S phase

(b) Interphase

(c) G2 phase

(d) G0 phase

This question was addressed to me in an interview for job.

This intriguing question comes from Cellular Reproduction in portion DNA Replication and Repair, Cellular Reproduction of Cell Biology

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Correct choice is (a) S phase

Explanation: DNA replication occurs during the synthesis (S) phase of the cycle. During this phase additional histones are also synthesized that will be needed as the cell doubles the number of nucleosomes in its chromosomes.

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