Which Choice Has the BEST Labels for This Amino Acid

Multiple Choice

Which choice has the BEST labels for this amino acid?

A) 1: amino acid 2: carbon 3: side chain 4: alcohol
B) 1: amide 2: α-carbon 3: R 4.ester
C) 1: amine 2: side chain 3: α-carbon 4.ester
D) 1: amide 2: α-carbon 3: side chain 4.carbonyl
E) 1: amine 2: α-carbon 3: side chain 4.carboxylic acid