Final answer:
Inside the nucleus, DNA is wound tightly around proteins and packaged into compact units called nucleosomes. Nucleosomes consist of DNA wrapped around a set of histone proteins.
Step-by-step explanation:
In the nucleus, DNA is wound tightly around proteins and packaged into compact units called nucleosomes. Nucleosomes are composed of DNA wrapped around a set of histone proteins. Histones are highly conserved proteins that are rich in basic amino acids and form an octamer. The DNA is negatively charged due to phosphate groups, and it is wrapped tightly around the histone core. This compacted structure is often referred to as 'beads on a string.'