Feedback for Multiple Choice Quiz 6

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  1. After reaction with CNBr, peptides are cleaved following internal Met residues. The C-terminus is a modified Met residue; see p. 125.

  2. Chymotrypsin is specific for cleavage after the large aromatic residues, e.g. Phe, Tyr, and Trp.

  3. Figs. 4.2 is a good illustration of H-bond geometry in a-helices. H-bonds are about 3Å in length. Nothing is more numerous in proteins than van der Waals interactions!

  4. b-sheeets are pleated, not flat. The H-bond geometry between b-strands is shown in Figs. 4.4 and 4.5.

  5. Only the secondary structure is determined, i.e. the conformation of the mainchain or backbone. Tertiary structure includes the positions of all of the side chains.