Characteristics of disulfide bonds in proteins include all of the following EXCEPT
A) they are an example of a post-translational modification.
B) they are common in proteins secreted from cells.
C) they may cross-link two polypeptides in a globular protein.
D) they may form with the assistance of a chaperone.
E) they may stabilize the alpha-helix conformation.

Question

Quizplus · Accepted Answer

Disulfide bonds do not stabilize the alpha-helix conformation. They may stabilize the tertiary structure of a protein by forming between two cysteine residues, but they do not specifically affect the secondary structure. The other characteristics listed are correct.

Characteristics of Disulfide Bonds in Proteins Include All of the Following