Multiple Choice
During which phase of the cell cycle does DNA replication occur?
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16. Cell Division
DNA Replication
Multiple Choice
During which stage of the cell cycle are chromosomes duplicated (DNA replication occurs)?
A
M phase (mitosis)
B
G1 phase of interphase
C
G2 phase of interphase
D
S phase of interphase
Verified step by step guidance1
Understand the overall structure of the cell cycle, which consists of interphase and the M phase (mitosis). Interphase includes G1, S, and G2 phases.
Recall that the G1 phase is primarily a period of cell growth and preparation for DNA synthesis, but DNA replication does not occur here.
Identify that the S phase (Synthesis phase) is the specific stage during interphase when DNA replication takes place, resulting in duplicated chromosomes.
Recognize that the G2 phase follows DNA replication and involves further growth and preparation for mitosis, but no DNA duplication occurs here.
Conclude that chromosomes are duplicated during the S phase of interphase, not during M phase, G1, or G2 phases.
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