Read the following statements about satellite DNA and pick out the correct one

Options

A. 1)It is not found in centromeres
B. 2)It consists of non repetitive coding DNA
C. 3)It is a structural constituent of hetero-chromatin
D. 4)It occurs in all locations of human genome

Answer

To determine the correct statement about satellite DNA, we will analyze each of the provided options step by step:

1. **Understanding Satellite DNA**:
- Satellite DNA is a type of DNA that consists of repetitive non-coding sequences. It is an important component of the genome, particularly in the structure of chromosomes.

2. **Analyzing the Options**:
- **Option 1**: "It is not found in centromere."
- This statement is incorrect because satellite DNA is a major component of the centromere, which is the region of the chromosome that links sister chromatids.

- **Option 2**: "It consists of non-repetitive coding DNA."
- This statement is also incorrect. Satellite DNA consists of repetitive non-coding sequences, not non-repetitive coding DNA.

- **Option 3**: "It is a structural constituent of heterochromatin."
- This statement is correct. Satellite DNA is indeed a structural component of heterochromatin, which is the tightly packed form of DNA found in chromosomes.

- **Option 4**: "It occurs in all locations of the human genome."
- This statement is incorrect. Satellite DNA is not found in all locations of the human genome; it is specifically located in certain regions, such as the centromeres.

3. **Conclusion**:
- After analyzing all the options, the correct statement about satellite DNA is **Option 3**: "It is a structural constituent of heterochromatin."