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| Description: These hypothetical structures show the effect of varying the number (n) of polypeptide residues per turn of a helix. The n = 4 and n = 3 helices are right-handed, the n = -3 helix is left-handed, an n = 2 (a flat ribbon) has no handedness. The right-handed a-helix (not shown), with n = 3.6, is intermediate between the n = 3 and n = 4 structures. Picture Stats: Views: 204 Filesize: 193.35kB Height: 315 Width: 814 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=34082 |