In SAT chromosome,SAT (satellite) is terminal part of chromosome beyond secondary constriction, it contains:
(a) DNA
(b) RNA
(c) repetitive DNA
(d) None of these

Options

A. DNA
B. RNA
C. repetitive DNA
D. None of these

Answer

To answer the question regarding the contents of the satellite (SAT) chromosome, we can break it down step by step:

### Step-by-Step Solution:

1. **Understanding Satellite Chromosomes**:
- Satellite chromosomes, or SAT chromosomes, are specific parts of chromosomes that are located at the terminal ends, beyond the secondary constriction.

2. **Identifying the Contents**:
- The question asks what is contained in the satellite part of the chromosome. The options given are DNA, RNA, repetitive DNA, or none of these.

3. **Analyzing the Options**:
- **Option (a) DNA**: While it is true that satellite chromosomes contain DNA, this option is too broad and does not specify the type of DNA.
- **Option (b) RNA**: Satellite chromosomes do not primarily contain RNA, so this option is not correct.
- **Option (c) Repetitive DNA**: Satellite regions are known to contain highly repetitive DNA sequences. This is a specific characteristic of satellite DNA, making this option a strong candidate.
- **Option (d) None of these**: This option can be eliminated since we know that satellite chromosomes do contain DNA.

4. **Conclusion**:
- After analyzing the options, the most accurate answer is **(c) repetitive DNA**. This is because the satellite regions are characterized by having sequences that are repeated multiple times.

### Final Answer:
(c) repetitive DNA

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