KEY TERMS

double helix

deoxyribonucleic acid (DNA)

deoxyribose

ribose

purine

pyrimidine

ribonucleic acid (RNA)

nucleoside

nucleotide

Watson-Crick base pair

semiconservative replication

B-DNA

A-DNA

Z-DNA

major groove

minor groove

supercoiling

histone

chromatin

nucleosome

nucleosome core particle

stem-loop