DNA & RNA / Double Helix · Base Pairing
B-DNA built to scale: edit the sequence, count the hydrogen bonds, follow each strand 5′→3′ and find the major and minor grooves.
P (phosphate)
A
T
G
C
U
C (atoms)
N
O
Spin5′→3′GroovesDimensions
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Note helix: 10 bp per turn, 0.34 nm rise, P at 0.89 nm radius · base pairs: idealised Watson–Crick geometry