Cell cycle and apoptosis · USMLE Step 1

Which phase immediately follows completion of DNA replication in the cell cycle and precedes mitosis?

  1. G1 phase
  2. S phase
  3. G2 phase
  4. Anaphase
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Correct answer: G2 phase

After S phase (DNA synthesis), the cell enters G2 phase to synthesize proteins and organelles needed for mitosis, and to perform final checks before entering M phase.

Difficulty: Medium Question 6 of 19

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