In which of the following phase (s) of Cell cycle, both, the RNA synthesis and Protein synthesis occurs:

**Core Concept**
The cell cycle refers to the series of events that take place in a cell, leading to its division and duplication. The cell cycle consists of four phases: G1, S, G2, and M. The S phase is crucial for DNA replication, and RNA and protein synthesis play a vital role in this phase.

**Why the Correct Answer is Right**
During the S phase, the cell replicates its DNA, and RNA synthesis occurs to transcribe the genetic material into messenger RNA (mRNA). This mRNA is then translated into proteins, which are essential for DNA replication, repair, and cell division. The enzymes involved in DNA replication, such as helicase and topoisomerase, are synthesized during this phase. The presence of these proteins ensures accurate and efficient replication of the genetic material.

**Why Each Wrong Option is Incorrect**
**Option A:** G1 phase is incorrect because, although RNA and protein synthesis occur in this phase, it is primarily focused on cell growth and preparation for DNA replication.

**Option B:** M phase is incorrect because, during this phase, the chromosomes are condensed, and DNA replication is completed. RNA and protein synthesis are not necessary during this phase.

**Option C:** G2 phase is incorrect because, although some protein synthesis may occur, RNA synthesis is not as active as it is during the S phase.

**Clinical Pearl / High-Yield Fact**
The S phase is the most critical phase for RNA and protein synthesis, as it requires the production of enzymes and proteins necessary for accurate DNA replication.

**Correct Answer:** .