The following diagram shows a dipeptide with various parts of the molecule numbered (1 to 4).
Which row of the table below correctly identifies each labelled part of this dipeptide?
1 | 2 | 3 | 4 | |
A. | Carboxyl group | Peptide bond | R-group | Amino group |
B. | R-group | Amino group | Peptide bond | Carboxyl group |
C. | Amino group | Carboxyl group | Peptide bond | R-group |
D. | Amino group | Peptide bond | R-group | Carboxyl group |
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