Question

During cell cycle, DNA replication takes place in

• A. G${}_0$ phase
• B. G${}_1$ phase
• C. G${}_2$ phase
• D. M phase
• E. S phase

Answer 1

The correct option is E S phase

• The G${}_1$ phase is the gap between M phase and S phase and is marked by synthesis of RNA and protein (excluding histones) and duplication of all cell content except DNA.
• S phase of DNA replication is followed by G${}_2$ phase during which cell double-checks the duplicated DNA content.
• The M phase of cell cycle is marked by the division of the nucleus and cytokinesis to produce daughter cells. G${}_0$ phase is the quiescent stage.

So, the correct answer is option E.