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| Description: (a) The primary structure is the amino acid sequence, represented by the peptide units. (b) Hydrogen bonding between amino acids in the polypeptide chain can form a pleated sheet, an alpha helix, or a random coil. (c) Folding of the secondary structures into a functional three-dimensional shape creates the tertiary level of structure. Some functional proteins are made up of more than one polypeptide chain, and this level is the quaternary structure (not shown here). Picture Stats: Views: 152 Filesize: 233.51kB Height: 1153 Width: 1500 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=44499 |