Nucleic acid double helix - Wikipedia
https://en.wikipedia.org/wiki/Nucleic_acid_double_helix
OverviewHelix geometriesHistoryNucleic acid hybridizationBase pair geometryBendingStretchingSupercoiling and topologyAt least three DNA conformations are believed to be found in nature, A-DNA, B-DNA, and Z-DNA. The B form described by James Watson and Francis Crick is believed to predominate in cells. It is 23.7 Å wide and extends 34 Å per 10 bp of sequence. The double helix makes one complete turn about its axis every 10.4–10.5 base pairs in solution. This frequency of twist (termed the helical pit…
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