Cystine is likely to be isolated from proteins that are
A) high in methionine.
B) high in peptide-linked cysteine.
C) intracellular.
D) extracellular.

Question

Quizplus · Accepted Answer

Cystine is a dimer of cysteine that is formed by the oxidation of two cysteine residues. Cysteine is a sulfur-containing amino acid that is found in many proteins. Proteins that are high in peptide-linked cysteine are more likely to form cystine because the cysteine residues are more likely to be close to each other in the protein structure.

Cystine Is Likely to Be Isolated from Proteins That Are