Histones are not rich in:

Options

A. Basic amino acids
B. Acidic amino acids
C. Lysine
D. Arginine

Explanation

To solve the question "Histones are not rich in:", we need to analyze the characteristics of histones and the types of amino acids they contain.

### Step-by-Step Solution:

1. **Understanding Histones**: Histones are proteins that play a crucial role in the packaging of DNA into a compact, organized structure known as chromatin. They help in the condensation of DNA, making it fit within the nucleus of a cell.

2. **Composition of Histones**: Histones are known to be rich in basic amino acids. The primary basic amino acids found in histones are lysine and arginine. These amino acids carry a positive charge, which allows them to interact with the negatively charged DNA.

3. **Identifying the Options**: The question provides four options:
- A) Basic amino acids
- B) Acetic amino acids
- C) Lysine
- D) Arginine

4. **Analyzing Each Option**:
- **Basic Amino Acids**: Histones are rich in basic amino acids, so this option is not correct.
- **Acetic Amino Acids**: This term is not commonly used in the context of amino acids. It suggests amino acids that have an acidic nature, which would not be abundant in histones.
- **Lysine**: This is a basic amino acid and is indeed abundant in histones.
- **Arginine**: This is also a basic amino acid and is found in high amounts in histones.

5. **Conclusion**: Since histones are known to be rich in basic amino acids, lysine, and arginine, the only option that does not fit is B) Acetic amino acids.

### Final Answer:
Histones are not rich in **B) Acetic amino acids**.