Question

........... is the 'post mitotic phase' of the cell in which active synthesis of RNA and proteins takes place.

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

Answer 1

Answer: (C)

G${}_1$ phase

A typical cell cycle comprises of interphase and mitotic phase (M phase). The interphase comprises of first growth phase or G${}_1$ phase, synthesis phase or S phase and second growth phase or G${}_2$ phase. The DNA synthesis occurs during S phase in the process of DNA replication. The S phase is followed by G${}_2$ phase, after which the cell enters mitotic phase. The G${}_1$ phase starts immediately after the mitotic phase and leads to the S phase. Hence, G${}_1$ is also called the post mitotic phase. It is during G${}_1$ phase that cell prepares for DNA replication and synthesis of DNA. The G${}_1$ phase is the phase for active protein synthesis. Various species of RNA, all the enzyme machinery and other proteins required for DNA replication are synthesized during G${}_1$ phase.

So, the correct answer is option C.