Which of the following statements is NOT true regarding the

Which of the following statements is NOT true regarding the comparison of the alpha-helix structure to the beta-sheet structure in proteins?

A-Each is an example of secondary structure

B-Each may occur in typical globular proteins

C-Each is stabilized by hydrogen bonds between different peptide chains

D-The peptide bond for each is critical to hold each together

Solution

C.Each is stabilized by hydrogen bonds between different peptide chains.

Alpha-helices resemble a coiled spring, with hydrogen bonding occurring in an intra-chain arrangement between carbonyl oxygens and amide hydrogens that is parallel to the central axis. Beta sheets, on the other hand, may have either inter- or intra-chain hydrogen bonding between carbonyl oxygens and amide hydrogens.