Synthesis of RNA and proteins takes place in :

Options

A. M-phase
B. S-phase
C. `G_(1)`phase
D. `G_(1)andG_(2)`phase

Answer

To answer the question regarding where the synthesis of RNA and proteins takes place, we can analyze the different phases of the cell cycle step by step:

### Step-by-Step Solution:

1. **Understanding the Cell Cycle Phases**:
- The cell cycle consists of several phases: G1, S, G2, and M phase.
- Each phase has specific functions related to cell growth, DNA replication, and cell division.

2. **Analyzing the M Phase**:
- The M phase (mitotic phase) involves nuclear division (karyokinesis) followed by cytoplasmic division (cytokinesis).
- During this phase, the cell is primarily focused on dividing and not on synthesizing RNA or proteins.
- **Conclusion**: M phase is not the correct answer.

3. **Analyzing the S Phase**:
- The S phase (synthesis phase) is primarily concerned with DNA replication.
- While DNA is being synthesized, RNA and protein synthesis do not predominantly occur in this phase.
- **Conclusion**: S phase is not the correct answer.

4. **Analyzing the G1 Phase**:
- The G1 phase (first gap phase) is where the cell grows and synthesizes various molecules, including RNA and proteins.
- This phase is crucial for preparing the cell for DNA synthesis.
- **Conclusion**: G1 phase is a correct answer for RNA and protein synthesis.

5. **Analyzing the G2 Phase**:
- The G2 phase (second gap phase) follows the S phase and involves further growth and preparation for mitosis.
- During this phase, the cell synthesizes proteins necessary for cell division, including tubulin for spindle formation.
- **Conclusion**: G2 phase also contributes to RNA and protein synthesis.

6. **Final Conclusion**:
- RNA and protein synthesis occurs during both the G1 and G2 phases of the cell cycle.
- Therefore, the correct answer to the question is **G1 and G2 phase**.

### Final Answer:
The synthesis of RNA and proteins takes place in the **G1 and G2 phases** of the cell cycle.