Which one is correct for `G_(0)` stage ?
I. It is a quiescent stage.
II. In this phase cell cycle is stopped
III. `G_(0)` cells do not grow or proliferate but metabolically active
IV. `G_(0)` cells can divide in response to some stimulus

Options

A. All are correct
B. I,II,III are correct
C. I,II are correct
D. Only I and IV are correct

Answer

To determine which statements are correct regarding the G0 stage of the cell cycle, let's analyze each option step by step.

### Step 1: Understanding G0 Stage
The G0 stage, also known as the quiescent stage, is a phase where cells exit the cell cycle and enter a resting state. Cells in this phase are not actively dividing but can remain metabolically active.

### Step 2: Analyzing Each Statement
1. **Statement I: It is a quiescent stage.**
- This statement is **correct**. The G0 phase is indeed referred to as a quiescent stage where cells are not actively preparing to divide.

2. **Statement II: In this phase, the cell cycle is stopped.**
- This statement is also **correct**. During the G0 phase, the cell cycle is effectively halted, and the cell does not proceed to the next phases of division unless stimulated.

3. **Statement III: G0 cells do not grow or proliferate but are metabolically active.**
- This statement is **correct** as well. Cells in the G0 phase do not undergo division (proliferation) but continue to perform their normal metabolic functions.

4. **Statement IV: G0 cells can divide in response to some stimulus.**
- This statement is **correct**. G0 cells can re-enter the cell cycle and divide if they receive appropriate external signals or stimuli.

### Conclusion
All four statements about the G0 stage are correct. Therefore, the answer is that all options (I, II, III, and IV) are true regarding the G0 stage.

### Final Answer
All statements (I, II, III, IV) are correct for the G0 stage.

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