How many histones make the core part of a nucleosome? What is the basis of binding DNA molecule to the histones?

Explanation

### Step-by-Step Solution:

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

2. **Number of Histones in a Nucleosome**:
- The core of a nucleosome is made up of an octamer of histones. An octamer consists of 8 histone proteins. Specifically, it includes two copies each of four different types of histones: H2A, H2B, H3, and H4. Therefore, the total number of histones that make up the core part of a nucleosome is **8**.

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