Ace A Level Biology 2025 – Dive Deep and Conquer Science!

The bond that connects amino acids together in proteins is called a peptide bond. This bond is formed through a dehydration synthesis reaction, where the carboxyl group of one amino acid reacts with the amino group of another amino acid, resulting in the release of a water molecule and the formation of a covalent bond between the two amino acids. This process links the amino acids into polypeptide chains, which eventually fold into functional proteins. The stability and specificity of peptide bonds are critical for maintaining the structure and function of proteins in biological systems.

The other types of bonds listed do not connect amino acids in proteins; for instance, glycosidic bonds connect monosaccharides in carbohydrates, hydrogen bonds play a role in secondary and tertiary structure stabilization, and ionic bonds may influence protein structure through interactions between charged side chains, but they do not directly link amino acids.