Which of the following statements about cystine is correct?
A) Cystine forms when the -CH2-SH R group is oxidized to form a -CH2-S-S-CH2- disulfide bridge between two cysteines.
B) Cystine is an example of a nonstandard amino acid,derived by linking two standard amino acids.
C) Cystine is formed by the oxidation of the carboxylic acid group on cysteine.
D) Cystine is formed through a peptide linkage between two cysteines.
E) Two cystines are released when a -CH2-S-S-CH2- disulfide bridge is reduced to -CH2-SH.
Correct Answer:
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