Question

Which stage of cell cycle is characterised by DNA replication, synthesis of histones and formation of new nucleosomes?

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

Answer 1

Answer: (A)

S phase

S phase of interphase is involved in DNA replication, synthesis of histones and formation of new nucleosomes. S phase (synthesis phase) is the part of the cell cycle in which DNA is replicated. It occurs between G${}_1$ phase and G${}_2$ phase. DNA replication is necessary to prevent genetic abnormalities which often lead to cell death or disease.

So, the correct answer is option A.