The nucleolar chromatin contains gene for :–

Options

A. B–DNA
B. Z–DNA
C. r–RNA
D. Satellite–DNA

Answer

To answer the question "The nucleolar chromatin contains gene for:", we will analyze the options provided and determine which one is correct based on our understanding of nucleolar chromatin and its functions.

### Step-by-Step Solution:

1. **Understanding Nucleolar Chromatin**:
- The nucleolar chromatin is a specific type of chromatin found within the nucleolus of the cell. It plays a crucial role in the synthesis of ribosomes.

2. **Analyzing the Options**:
- **Option A: B-DNA**:
- B-DNA is the common form of DNA that exists in a right-handed double helix structure. It is not specifically related to the function of the nucleolus. Therefore, this option is incorrect.

- **Option B: Z-DNA**:
- Z-DNA is a left-handed double helix form of DNA. It is not the primary form of DNA involved in ribosome synthesis. Thus, this option is also incorrect.

- **Option C: RNA**:
- The nucleolar chromatin is primarily involved in the synthesis of ribosomal RNA (rRNA), which is essential for ribosome formation. This makes this option correct.

- **Option D: Satellite DNA**:
- Satellite DNA refers to repetitive sequences of DNA that are not directly involved in the synthesis of ribosomes. Therefore, this option is incorrect.

3. **Conclusion**:
- After analyzing all the options, the correct answer is **RNA**, as the nucleolar chromatin contains genes for ribosomal RNA synthesis.

### Final Answer:
The nucleolar chromatin contains genes for **RNA** (specifically ribosomal RNA).

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