The secondary level of protein structure involves
A) folding of the primary structure upon itself.
B) the number of peptide bonds in a polypeptide chain.
C) substitutions in the amino acid sequence.
D) interactions with other polypeptide chains.
E) none of these.

Question

Quizplus · Accepted Answer

The secondary structure of a protein involves the folding of the polypeptide chain upon itself, typically forming alpha helices, beta sheets, or turns. This folding is stabilized by hydrogen bonding between peptide bonds in different regions of the chain. Substitutions in the amino acid sequence and interactions with other polypeptide chains (quaternary structure) are related to other levels of protein structure. The number of peptide bonds in a polypeptide chain is related to its length, but does not directly influence its secondary structure.

The Secondary Level of Protein Structure Involves