### Step-by-Step Solution:
1. **Definition of Nucleosome**: A nucleosome is a structural unit of chromatin in eukaryotic cells. It consists of a segment of DNA wrapped around a core of histone proteins.
2. **Components of Nucleosome**: The nucleosome is formed when double-stranded DNA (often referred to as "double helix DNA") wraps around a core made up of eight histone proteins. These histones are positively charged.
3. **Formation of Nucleosome**: The interaction between the negatively charged DNA and the positively charged histone proteins leads to the formation of the nucleosome. The DNA wraps around the histone octamer, creating a bead-like structure.
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