Under review — part of this question (a structure or an option) is not clear in the source scan. 4AB is checking it against the original book; the answer shown may change.
The constituent amino acids present in the following dipeptide, respectively, are
(a)(R)-aspartic acid and (S)-lysine
(b)(S)-aspartic acid and (R)-lysine
(c)(R)-glutamic acid and (S)-arginine
Answer
Under review — not yet confirmed.
Answer (as printed): A
Explanation
Constituent amino acid present in above dipeptide can be shown as
Explanation as extracted from the printed page; notation may be imperfect.