During Which Phase of the Cell Cycle Does the Cell

Question

During which phase of the cell cycle does the cell initiate replication of its nuclear DNA?
A) Gap 1 phase
B) Metaphase
C) Gap 2 phase
D) Synthesis phase
E) Gap 0 phase

Accepted Answer

DNA replication occurs during the Synthesis (S) phase of the cell cycle. This phase follows the first gap phase (G1) and precedes the second gap phase (G2), leading up to mitosis.