If the molecules indicated by A are amino acids then the lin

If the molecules indicated by (A) are amino acids, then the line in the figure indicated by (D) is a hydrogen bond a peptide bond an active site an R group

Solution

Peptide bond

If the molecules indicated by (A) are amino acids, then the line in the figure indicated by (D) is Peptide bond

In polypeptide chain, the amino acids are connected with each other through peptide bond and peptide bond is formed through a process of condensation, where water will be released out.