Synthesis of proteins occurs during :-

Options

A. `G_(1)`
B. `G_(2)`
C. S
D. All the above

Answer

To determine during which phase of the cell cycle protein synthesis occurs, we can analyze each phase of the cell cycle:

1. **G1 Phase (Gap 1)**:
- During the G1 phase, the cell grows and synthesizes various proteins necessary for DNA replication and other cellular functions. This includes the synthesis of proteins that are involved in the transcription of mRNA.
- **Hint**: Think about the initial growth and preparation of the cell for DNA replication.

2. **S Phase (Synthesis Phase)**:
- The S phase is primarily known for DNA replication, but it is also a time when histone proteins are synthesized. Histones are essential for packaging DNA into chromatin.
- **Hint**: Remember that histones are crucial for DNA structure and are made during the DNA synthesis phase.

3. **G2 Phase (Gap 2)**:
- In the G2 phase, the cell continues to grow and produces proteins that are necessary for cell division. One of the key proteins synthesized during this phase is tubulin, which is important for forming the mitotic spindle.
- **Hint**: Consider the preparations needed for cell division and the proteins that support this process.

4. **Conclusion**:
- Since protein synthesis occurs in all three phases (G1, S, and G2), the correct answer to the question is **"All of the above."** This means that proteins are synthesized during G1, S, and G2 phases of the cell cycle.

**Final Answer**: The synthesis of proteins occurs during all of the above phases: G1, S, and G2.

---