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| Description: a) In the a-helix the hydrogen bonds are within a single polypeptide chain and are almost parallel to the helix axis. The alignment of amide bonds in the helix gives rise to a macrodipole moment. The N-terminal end of the helix has a d+ charge and the C-terminal end has a d- charge. (b) In the b-sheet, the hydrogen bonds are between adjacent chains and are nearly perpendicular to the chains. (c) The 310 helix is found in proteins; but, is less common than the a-helix. Picture Stats: Views: 326 Filesize: 296.26kB Height: 600 Width: 715 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=34081 |