Number of histone proteins in each nucleosome core is
(a) 8
(b) 10
(c) 12
(d) 14

Options

A. 8
B. 10
C. 12
D. 14

Answer

To determine the number of histone proteins in each nucleosome core, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Nucleosome Structure**:
- A nucleosome is the basic unit of DNA packaging in eukaryotic cells. It consists of a segment of DNA wrapped around a core of histone proteins.

2. **Identifying Histone Types**:
- There are four main types of histone proteins involved in forming the nucleosome core: H2A, H2B, H3, and H4.

3. **Counting Histone Proteins**:
- Each type of histone protein is present in pairs. Therefore, for each of the four types:
- 2 H2A
- 2 H2B
- 2 H3
- 2 H4
- This results in a total of:
- 2 (H2A) + 2 (H2B) + 2 (H3) + 2 (H4) = 8 histone proteins.

4. **Conclusion**:
- The total number of histone proteins in each nucleosome core is 8.

### Final Answer:
(a) 8

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