Which one is the correct sequence of a cell cycle?

Options

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

Answer

To determine the correct sequence of the cell cycle, we need to understand the phases involved in the cycle. The cell cycle consists of several key stages: G1, S, G2, and M. Here’s the step-by-step breakdown of the correct sequence:

### Step-by-Step Solution:

1. **Identify the Phases of the Cell Cycle**:
- The cell cycle is divided into four main phases:
- G1 (Gap 1)
- S (Synthesis)
- G2 (Gap 2)
- M (Mitosis)

2. **Understand Each Phase**:
- **G1 Phase**: This is the first phase where the cell grows and synthesizes proteins necessary for DNA replication.
- **S Phase**: During this phase, DNA replication occurs, resulting in the duplication of the genetic material.
- **G2 Phase**: In this phase, the cell continues to grow and prepares for mitosis. It synthesizes proteins and organelles needed for cell division.
- **M Phase**: This is the mitotic phase where the cell divides into two daughter cells.

3. **Determine the Correct Sequence**:
- The correct sequence of the cell cycle is G1 → S → G2 → M. This means that the cell first grows (G1), then duplicates its DNA (S), prepares for division (G2), and finally divides (M).

4. **Evaluate the Options**:
- Option A: G2M, G1S - Incorrect
- Option B: S, G2, M, G1 - Incorrect
- Option C: G1, S, G2, M - Correct
- Option D: MG1SG2 - Incorrect

5. **Conclusion**:
- The correct answer is **Option C: G1, S, G2, M**.