Which one is stored in `G_(1)-phase` ?

Options

A. ATP
B. Tubulin
C. Histone
D. All the above

Answer

### Step-by-Step Solution:

1. **Understanding the G1 Phase**: The G1 phase is the first gap phase in the cell cycle that occurs after cell division (mitosis) and before DNA replication (S phase). It is a period of growth and preparation for DNA synthesis.

2. **Identifying the Storage Function**: During the G1 phase, the cell is actively growing and synthesizing various molecules necessary for the next phase. This includes the storage of energy in the form of ATP (adenosine triphosphate), which is crucial for cellular functions.

3. **Analyzing the Options**:
- **ATP**: This is stored during the G1 phase as the cell prepares for DNA replication and other metabolic activities.
- **Tubulin**: This protein is primarily synthesized during the G2 phase, not G1.
- **Histone**: These proteins are synthesized during the S phase when DNA is being replicated.
- **All of the above**: Since tubulin and histone are not stored in the G1 phase, this option is incorrect.

4. **Conclusion**: The correct answer is that ATP is stored in the G1 phase of the cell cycle.

### Final Answer:
**ATP is stored in the G1 phase.**

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