DNA Structure vs Chromatin: Double Helix and Nucleosome Organization #1422374 (License: Personal Use)

The image illustrates two fundamental levels of DNA organization: the canonical double helix on the right, with labeled adenine-thymine and guanine-cytosine base pairs, and the higher-order chromatin structure on the left, where DNA wraps around histone octamers to form nucleosomes. Arrows indicate that both structures consist of two parallel helical strands, emphasizing their shared helical geometry despite differing complexity. This comparison helps clarify how compact chromatin enables meters of DNA to fit inside a microscopic nucleus while remaining accessible for transcription and replication.

Used in educational biology webpages, genetics courses, or molecular biology resources to explain genome packaging; matches user intent seeking visual clarification of DNA hierarchy from nucleotides to chromosomes.