Which of the following amino acids are correctly represented by the given three-letter abbreviations?
I. Cys — cysteine
II. Asn — aspartic acid
III. Arg — arginine
IV. Pro — serine
V. Glu — glutamine

• A. I and III
• B. I, III, and V
• C. I, II, and V
• D. I, II, III, and V

Answer: (A)