What is nucleosome? Give its chemical nature.

Explanation

### Step-by-Step Solution:

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

2. **Structure of Nucleosome**:
- Each nucleosome is made up of approximately 147 base pairs of DNA that are wrapped around a core of eight histone proteins. This structure resembles a "bead on a string" when viewed under a microscope, where the "beads" are the nucleosomes and the "string" is the DNA.

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