Which one is the correct sequence of a cell cycle?

Options

A. `G_(2)rarrMrarrG_(1)rarrS`
B. `SrarrG_(2)rarrMrarrG_(1)`
C. `G_(1)rarrSrarrG_(2)rarrM`
D. `MrarrG_(1)rarrSrarrG_(2)`

Explanation

To determine the correct sequence of the cell cycle, we need to understand the phases involved in the process. The cell cycle consists of two main phases: interphase and mitosis (M phase). Interphase is further divided into three stages: G1 phase, S phase, and G2 phase.

### Step-by-Step Solution:

1. **Identify the Phases of the Cell Cycle**:
- The cell cycle consists of two main phases: Interphase and M phase (mitosis).
- Interphase is where the cell prepares for division and is divided into three stages: G1, S, and G2.

2. **Understand Each Phase**:
- **G1 Phase**: This is the first gap phase where the cell grows and synthesizes proteins. DNA replication does not occur in this phase.
- **S Phase**: This is the synthesis phase where DNA replication occurs, resulting in the doubling of the amount of DNA.
- **G2 Phase**: This is the second gap phase where the cell continues to grow and prepares for mitosis. Here, organelles are duplicated, and proteins necessary for mitosis are synthesized.

3. **M Phase (Mitosis)**:
- This is the phase where actual cell division occurs, resulting in two daughter cells.

4. **Correct Sequence**:
- The correct order of the phases in the cell cycle is: G1 → S → G2 → M.
- Therefore, the correct answer is option C: G1, S, G2, M.

### Final Answer:
The correct sequence of the cell cycle is **C: G1, S, G2, M**.

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