Where can we find major and minor grooves ?

Options

A. RNA
B. DNA
C. Both RNA and DNA
D. None of these

Answer

To answer the question "Where can we find major and minor grooves?", we will analyze the structure of nucleic acids, specifically focusing on DNA.

### Step-by-Step Solution:

1. **Understanding Nucleic Acids**:
- Nucleic acids are biomolecules essential for all forms of life. The two main types are DNA (deoxyribonucleic acid) and RNA (ribonucleic acid).

2. **Structure of DNA**:
- DNA is a double-stranded molecule that forms a double helix structure. This double helix is composed of two strands that wind around each other.

3. **Major and Minor Grooves**:
- In the double helical structure of DNA, the arrangement of the strands creates regions known as grooves.
- **Major Groove**: This is the wider of the two grooves. In the major groove, the base pairs are farther apart, allowing proteins to interact more easily with the bases.
- **Minor Groove**: This is the narrower groove where the base pairs are closer together.

4. **Characteristics of B-DNA**:
- The most common form of DNA is B-DNA, which has a right-handed helix.
- The diameter of B-DNA is approximately 20 angstroms, and there are about 10 base pairs per turn of the helix.

5. **Conclusion**:
- Major and minor grooves are structural features of DNA. Therefore, the correct answer to the question is that major and minor grooves can be found in **DNA (deoxyribonucleic acid)**.

### Final Answer:
The major and minor grooves are found in **DNA (deoxyribonucleic acid)**.

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