Question

DNA synthesis occurs in

• A. G-phase
• B. S-phase
• C. $G_2$ phase
• D. M phase

Answer 1

The correct option is 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 every single helix is duplicated by the assembly of nucleotides by DNA polymerase.

So, the correct answer is 'S-phase'.