Post-mitolic gap phase is characterised by all, except

Options

A. Synthesis of histone proteins
B. Synthesis of RNA and nucleotides
C. Most-variable in length
D. No change in DNA contents

Answer

To solve the question regarding the characteristics of the post-mitotic gap phase, we will analyze each option provided and determine which one does not belong to the characteristics of this phase.

### Step-by-Step Solution:

1. **Understanding the Post-Mitotic Gap Phase**:
- The post-mitotic gap phase, also known as G1 phase, occurs after mitosis and before the synthesis phase (S phase) of the cell cycle. During this phase, the cell prepares for DNA replication and performs various metabolic activities.

2. **Analyzing Option A: Synthesis of Histone Proteins**:
- Histone proteins are crucial for DNA packaging and are synthesized during the S phase when DNA replication occurs. Therefore, the synthesis of histone proteins does not take place during the post-mitotic gap phase. This option is likely the correct answer to the question.

3. **Analyzing Option B: Synthesis of RNA and Nucleotides**:
- During the post-mitotic gap phase, the cell actively synthesizes RNA and nucleotides, which are essential for various cellular functions and preparations for DNA synthesis. This option is characteristic of the post-mitotic gap phase.

4. **Analyzing Option C: Most Variable in Length**:
- The length of the post-mitotic gap phase can vary significantly depending on the cell type and environmental conditions. This variability is indeed a characteristic of this phase.

5. **Analyzing Option D: No Change in DNA Content**:
- During the post-mitotic gap phase, there is no DNA replication, which means that the DNA content remains unchanged. This is also a characteristic of the post-mitotic gap phase.

6. **Conclusion**:
- After analyzing all options, we find that Option A (synthesis of histone proteins) is the only statement that does not characterize the post-mitotic gap phase. Therefore, the correct answer is **Option A**.

### Final Answer:
**The post-mitotic gap phase is characterized by all, except: Option A - Synthesis of histone proteins.**

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