Which of the following statements is correct regarding `G_(0)` phase?

Options

A. Mitogens are present in `G_(0)` phase.
B. Mitogens are present but energy rich compounds are absent.
C. Both mitogens and energy rich compounds are present.
D. Neither mitogens nor energy rich compounds are present.

Answer

To answer the question regarding the G0 phase of the cell cycle, we will analyze the characteristics of this phase step by step.

### Step-by-Step Solution:

1. **Understanding the G0 Phase**:
- The G0 phase is a stage where cells exit the G1 phase of the cell cycle. It is often referred to as the quiescent phase.
- In this phase, cells are in a state of inactivity, meaning they do not grow or divide.

2. **Characteristics of G0 Phase**:
- Cells in the G0 phase are metabolically active but do not undergo cell division or proliferation.
- This phase can be considered a resting state where cells can remain for extended periods.

3. **Examples of Cells in G0 Phase**:
- Certain cells, such as heart cells and neurons, can enter the G0 phase and remain there until they are needed for repair or regeneration.

4. **Role of Mitogens**:
- Mitogens are substances that stimulate cell division. However, in the G0 phase, mitogens are not present because the cells are not preparing to divide.
- Since the cells are inactive, they do not perform the processes that occur in the G1 phase, such as growth and preparation for division.

5. **Conclusion**:
- The correct statement regarding the G0 phase is that it is a phase of total inactivity where cells do not grow or divide, and mitogens are absent.

### Final Answer:
The correct statement regarding the G0 phase is that it is a quiescent phase where cells neither grow nor divide, and mitogens are absent.

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