Which of the following statements regarding hydrogen bonding in secondary structures is true ?
A) Both α -helices and β -sheets only use intrachain hydrogen bonds.
B) Both α -helices and β -sheets only use interchain hydrogen bonds.
C) α -helices only use intrachain hydrogen bonds and β -sheets can use either intrachain or interchain hydrogen bonds.
D) α -helices can use either intrachain or interchain hydrogen bonds and β -sheets only use interchain hydrogen bonds.

Question

Quizplus · Accepted Answer

α-helices are stabilized by intrachain hydrogen bonds between the carbonyl oxygen of one amino acid and the amide hydrogen of another amino acid four residues away. β-sheets are stabilized by hydrogen bonds between the carbonyl oxygen of one strand and the amide hydrogen of another strand, which can be either from the same polypeptide chain (intrachain) or from different polypeptide chains (interchain).

Which of the Following Statements Regarding Hydrogen Bonding in Secondary