Total number of histone proteins associated with the cores of 180 nucleosomes

Options

A. 1220
B. 1620
C. 1440
D. 1400

Answer

To determine the total number of histone proteins associated with the cores of 180 nucleosomes, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of a Nucleosome**:
- A nucleosome consists of a segment of DNA wrapped around a core of histone proteins. Specifically, each nucleosome is made up of a histone octamer, which consists of 8 histone proteins.

2. **Identify the Number of Histones in One Nucleosome**:
- Each nucleosome contains 8 histone proteins (2 copies each of H2A, H2B, H3, and H4).

3. **Calculate the Total Number of Histones for 180 Nucleosomes**:
- Since each nucleosome has 8 histone proteins, for 180 nucleosomes, the total number of histone proteins can be calculated as follows:
\[ \text{Total histones} = \text{Number of nucleosomes} \times \text{Histones per nucleosome} \]
\[ \text{Total histones} = 180 \times 8 = 1440 \]

4. **Conclusion**:
- Therefore, the total number of histone proteins associated with the cores of 180 nucleosomes is **1440**.

### Final Answer:
The total number of histone proteins associated with the cores of 180 nucleosomes is **1440**.

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