The diagrams show the structures of two amino acids, one of which has two amine $\left( {-N{H_2}} \right)$ groups and the other has two carboxylic (–COOH) groups.
A peptide bond is formed between the two amino acids.
Which groups form the peptide bond?
1 and 3
2 )
2 and 3
3 )
2 and 4
4 )
4 and 1
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