Biomolecules Ques 55
55. The figure shows a hypothetical tetrapeptide portion of a protein with parts labelled A-D. Which one of the following option is correct?

(a) $A$ is the sulphur containing amino acid methionine
(b) D is the acidic amino acid - aspartic acid
(c) $C$ is an aromatic amino acid - phenylalanine
(d) $A$ is the $N$ - terminal amino acid and $D$ is $C$ terminal amino acid
Show Answer
Answer : b
Hints & Solutions
(b) Glutamic acid and aspartic acid are acidic amino acids with one carboxylic group and one amino group.