I know what major (2.2 nm) and minor (1.2 nm) groves are, but what is then name for:
a 360-degree rotation of DNA (3.4 nm)
the gap between each base pair (0.34 nm)?
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The term for distance covered in a 360° rotation of helix is known as the pitch of DNA helix, though there is no special name for distance covered between 2 base pairs. It can be called as rise per base pair of DNA. See the table below from this article:
Reference: Nucleic Acid Double Helix