Secondary structure
In addition to its primary structure, DNA can be described in terms of its secondary structure.
The Secondary structure of DNA describes the parameters of the double stranded macromolecule as a whole. See Image Gallery (Images 1-4)
For B-DNA (Classic or Watson-Crick DNA) Secondary Structure includes such features as:
Strands:
Antiparallel (one 5' to 3'; the other 3' to 5')
No irregular features
Backbone:
Smooth backbone line
Backbone on the outside, base-pairs on the inside
Backbone on the outside, base-pairs on the inside
Bases:
Bases paired (A-T, G-C)
Base-pairs flat, planar
10 bases per turn
Helix:
Right-handed helix (clockwise)
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