Nerve and muscle cells are In this phase:

Options

A. `G_(0)`
B. `G_(1)`
C. S
D. `G_(2)`

Answer

To determine the phase in which nerve and muscle cells are found, we need to analyze the cell cycle and the specific characteristics of these cells.

### Step-by-Step Solution:

1. **Understanding the Cell Cycle**: The cell cycle consists of several phases: Interphase (which includes G1, S, and G2 phases) and the M phase (mitosis). During interphase, the cell prepares for division.

2. **Identifying the Phases**:
- **G1 Phase**: This is the first gap phase where the cell grows and synthesizes proteins.
- **S Phase**: This is the synthesis phase where DNA is replicated.
- **G2 Phase**: This is the second gap phase where the cell prepares for mitosis.
- **M Phase**: This is the mitotic phase where the cell divides.

3. **G0 Phase**: Some cells, instead of continuing through the cell cycle, enter a resting state known as the G0 phase. This phase is characterized by a lack of division and is often referred to as the quiescent phase.

4. **Characteristics of Nerve and Muscle Cells**: Nerve cells (neurons) and heart muscle cells (cardiomyocytes) are specialized cells that have reached maturity. They undergo terminal differentiation, meaning they have fully developed and are no longer capable of dividing.

5. **Conclusion**: Since nerve and muscle cells do not divide and instead enter a resting state after they mature, they are found in the G0 phase of the cell cycle.

### Final Answer:
Nerve and muscle cells are in the **G0 phase**.

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