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