A typical nucleosome contains :

Options

A. 100 bp of DNA helix
B. 200 bp of DNA helix
C. 300 bp of DNA helix
D. 400 bp of DNA helix

Answer

To solve the question "A typical nucleosome contains:", we will follow these steps:

### Step-by-Step Solution:

1. **Understanding Nucleosome Structure**:
- A nucleosome is the fundamental unit of chromatin, which consists of DNA wrapped around histone proteins. This structure helps in packaging DNA into a compact form.

2. **Identifying the DNA Length in a Nucleosome**:
- The typical length of DNA that is associated with a single nucleosome is crucial for answering the question.

3. **Reviewing the Options**:
- The options provided are:
- A) 100 base pairs of DNA helix
- B) 200 base pairs of DNA helix
- C) 300 base pairs of DNA helix
- D) 400 base pairs of DNA helix

4. **Determining the Correct Answer**:
- It is known from biological studies that a typical nucleosome contains approximately 200 base pairs of DNA. This is the standard measurement for nucleosomes in eukaryotic cells.

5. **Final Answer**:
- Therefore, the correct answer to the question "A typical nucleosome contains:" is **B) 200 base pairs of DNA helix**.