Disulfide bridges can form in proteins ________.
A)only between cysteine residues side-by-side in the protein sequence
B)between cysteine residues that are close in three-dimensional space,but not necessarily close in the primary structure
C)between two cystine residues in proteins
D)between any two methionines or cysteines

Question

Quizplus · Accepted Answer

Disulfide bridges can form between cysteine residues that are close in three-dimensional space, but not necessarily close in the primary structure, as the cysteine side chains need to be close enough to bond with each other. Furthermore, disulfide bridges are not formed exclusively between cysteine residues, as methionines do not contain thiol groups needed for disulfide bond formation. Lastly, cystine is not a residue found in proteins, but rather a molecule that consists of two cysteine residues that are bonded together via a disulfide bridge.

Disulfide Bridges Can Form in Proteins ________