During cell growth, DNA synthesis takes place in

Options

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

Answer

### Step-by-Step Solution:

1. **Understanding Cell Growth and Division**:
- During cell growth, cells prepare for division. This process involves several phases, which are part of the cell cycle.

2. **Phases of the Cell Cycle**:
- The cell cycle consists of several phases: G1 phase (Gap 1), S phase (Synthesis), G2 phase (Gap 2), and M phase (Mitosis).
- Each phase has specific functions related to cell growth and preparation for division.

3. **Identifying the S Phase**:
- The S phase is specifically known for DNA synthesis. During this phase, the cell replicates its DNA, ensuring that each daughter cell will receive an identical set of genetic material.

4. **Role of Other Phases**:
- G1 Phase: This is the preparatory phase where the cell grows and increases its protein content.
- G2 Phase: This phase occurs after the S phase and serves as a checkpoint to ensure the cell is ready for mitosis.
- M Phase: This is where the actual division of the cell occurs, but it does not involve DNA synthesis.

5. **Conclusion**:
- Therefore, during cell growth, DNA synthesis specifically takes place in the S phase of the cell cycle.

### Final Answer:
DNA synthesis takes place in the S phase during cell growth.

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