Which of the following statements correctly describes the nature of hydrogen bonding in the secondary structures of proteins?

Step-by-step solution

In the -helix structure, the polypeptide chain twists into a right-handed screw, forming hydrogen bonds between the -NH group of each amino acid residue and the >C=O group of an adjacent turn of the same helix. This is an example of intramolecular hydrogen bonding. In the -pleated sheet structure, multiple peptide chains are stretched out to nearly maximum extension and laid side by side. They are held together by hydrogen bonds formed between the neighboring chains, which is an example of intermolecular hydrogen b