Question

The resulting functional group formed, when the amine group of an amino acid reacts with the carboxylic acid group of another amino acid, is:

• A. an amide
• B. an ester
• C. an amine
• D. a plastic
• E. none of the above

Answer 1

Answer: (A)

an amide

The resulting functional group formed when the amine group of an amino acid reacts with the carboxylic acid group of another amino acid is an amide.
$RCH\left(COOH\right)-N{H}_2+HOOC-CH\left(N{H}_2\right)R^{\prime }\to RCH\left(COOH\right)\underset{\text{amide group}}{-NH-C\left(O\right)-}CH\left(N{H}_2\right)R^{\prime }$