Question

Which of the following phase is a pre-DNA synthesis phase?

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

Answer 1

The correct option is A G${}_1$ phase

The G${}_1$ phase, is the first step of the interphase during the cell division. During this phase, the cell grows in size and synthesizes mRNA and proteins in preparation for subsequent steps leading to mitosis. G${}_1$ phase ends when the cell moves into the S phase of interphase. During G${}_1$ phase, the cell grows in size and synthesizes mRNA and proteins that are required for DNA synthesis. DNA synthesis occurs in S phase which happens after G${}_1$ phase. So, G${}_1$ phase is called as pre-DNA synthesis phase. S phase is the DNA synthesis phase. G${}_2$ and prophase are not called as pre-DNA synthesis phase.

So, the correct answer is option A.