One solenoid composed of :–

Options

A. 8–nucleosome
B. 6–nucleosome
C. 10–nucleosome
D. 16–nucleosome

Answer

To answer the question "One solenoid composed of:", we need to understand the structure of nucleosomes and how they come together to form a solenoid in eukaryotic cells.

### Step-by-Step Solution:

1. **Understanding Nucleosomes**:
- 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 (specifically an octamer of histones).

2. **Formation of Solenoids**:
- A solenoid is a higher-order structure formed by the coiling of nucleosomes. It is part of the organization of chromatin within the nucleus.

3. **Composition of Solenoids**:
- Research indicates that a solenoid is formed by the coiling of 6 nucleosomes. This means that when 6 nucleosomes come together, they create a solenoid structure.

4. **Evaluating Options**:
- The question provides several options regarding how many nucleosomes make up a solenoid.
- The correct answer is that a solenoid is composed of **6 nucleosomes**.

5. **Conclusion**:
- Therefore, the answer to the question "One solenoid composed of:" is **6 nucleosomes**.