What is a bond between amino acids called?

Peptide bond

The correct answer is Option (4) - Peptide bond

A bond between amino acids is called a peptide bond. When two amino acids undergo a condensation reaction, the carboxyl group (-COOH) of one amino acid reacts with the amino group (-NH2) of another amino acid, resulting in the formation of a peptide bond and the release of a water molecule. This process links the amino acids together to form a polypeptide chain, which is the basis of protein synthesis. Peptide bonds are covalent bonds formed between the carbon atom of the carboxyl group and the nitrogen atom of the amino group.