Histones are enriched with -

The correct answer is Lysine & Arginine

Expanation:

• The nucleosome is the basic structural unit of chromatin in eukaryotic cells. It plays a critical role in the packaging of DNA into a compact, dense shape, which allows for efficient storage and regulation of genetic information.
• A nucleosome consists of a segment of DNA wound around a core of histone proteins.
• Histones are rich in the basic amino acid residues lysine and arginine. Both the amino acid residues carry positive charges in their side chains.
• Histones are organised to form a unit of eight molecules called histone octamer.
• The histone core around which DNA is wrapped is composed of eight histone molecules: two each of histone proteins H2A, H2B, H3, and H4.
• The negatively charged DNA is wrapped around the positively charged histone octamer to form a structure called nucleosome
• A typical nucleosome contains 200 bp of DNA helix.