Target Exam

CUET

Subject

Biology

Chapter

Molecular Basis of Inheritance

Question:

In eukaryotes, the replication of DNA takes place at which phase of cell cycle?

Options:

M-Phase

S-Phase

$G_0$ Phase

$G_1$ Phase

Correct Answer:

S-Phase

Explanation:

The correct answer is Option (2) → S-Phase 

  • M-Phase (Mitotic phase): This is where cell division occurs (mitosis + cytokinesis), not DNA replication.
  • S-Phase (Synthesis phase): During this phase of interphase, DNA is replicated (synthesized) so that each chromosome has two sister chromatids.
  • G0 Phase: Resting phase; the cell is metabolically active but not dividing and not replicating DNA.
  • G1 Phase: Cell grows, prepares for DNA replication, but no DNA synthesis happens here.

Correct Answer: S-Phase