Which of the following phases of the cell cycle is not a part of interphase?

Options

A. S
B. `G_(1)`
C. `G_(0)`
D. M

Explanation

To determine which phase of the cell cycle is not a part of interphase, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Cell Cycle**: The cell cycle consists of two main stages: interphase and the M phase (mitotic phase).

2. **Identify Interphase Phases**: Interphase is further divided into three distinct phases:
- **G1 Phase (Gap 1)**: This is the first phase where the cell grows and synthesizes proteins.
- **S Phase (Synthesis)**: In this phase, DNA replication occurs, resulting in the duplication of the genetic material.
- **G2 Phase (Gap 2)**: This phase involves further growth, protein synthesis, and preparation for mitosis.

3. **Recognize the M Phase**: The M phase includes:
- **Karyokinesis**: The division of the nucleus.
- **Cytokinesis**: The division of the cytoplasm.

4. **Identify the Non-Interphase Phase**: Among the phases listed, the M phase is the only phase that is not part of interphase.

5. **Conclusion**: Therefore, the phase that is not a part of interphase is the M phase.

### Final Answer:
The phase of the cell cycle that is not a part of interphase is the **M phase**.

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