How do interchain hydrogen bonds in beta sheets differ from those in alpha helices?

• A. Interchain hydrogen bonds are only found in alpha helices.
• B. Interchain hydrogen bonds occur between different polypeptide chains, unlike alpha helices which only have intrachain bonds.
• C. Interchain hydrogen bonds are formed by disulfide linkages.
• D. Interchain hydrogen bonds are stronger than those in alpha helices.

Answer: (B)