Question

The DNA replication occurs in

• A. G${}_1$- phase
• B. S-phase
• C. G${}_2$- phase
• D. M-phase

Answer 1

Answer: (B)

S-phase

DNA replication occurs in the S phase of the cell cycle. During the S phase of the cell cycle, the DNA double helix is unwound by the enzyme helicase and each single helix is duplicated by assembly of nucleotides by DNA polymerase. Hence, option B is correct.