Question

The synthesis of RNA and protein takes place in which phase of the cell cycle?

• A. S phase
• B. M phase
• C. G${}_1$ and G${}_2$ phase
• D. None of the above

Answer 1

The correct option is C G${}_1$ and G${}_2$ phase

1st gap phase, as no DNA synthesis. 1st growth phase as of RNA, proteins, membranes in this phase. This phase generally takes about 30 to 50% part of entire cell division. Chromatin is fully extended, no more distinguishable chromosomes. Transcription of rRNA, tRNA, mRNA and protein synthesis (enzymes, regulatory proteins, tubulin and other mitotic apparatus proteins) occur in this phase. Synthesis of RNA and proteins continues in the second growth phase. This phase can be absent in division giving rise to pollen grains in higher plants. Nuclear envelope remains intact during interphase. Nucleolus greatly increased in size due to of rRNA and ribosomal proteins. So, the correct answer is option C.