Cell Cycle

AP Biology· difficulty 1/5

G1 S G2 M Interphase + Mitosis

DNA replication occurs during which phase?

  • A

    G1 phase

  • B

    S phase

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  • C

    M phase

  • D

    G2 phase

Explanation

The S (synthesis) phase of interphase is when chromosomal DNA is replicated, producing sister chromatids attached at the centromere.

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