LIFE SCIENCE

Detailed explanation-1: -However, all proteins contain an element not found in carbohydrates and lipids is nitrogen. Nitrogen which is present in all amino acids (the building blocks that make up the protein chains).

Detailed explanation-2: -Amino acids have amine (−NH2) groups in them, but carbohydrates do not. From the term, carbohydrates only contain carbon, hydrogen, and oxygen atoms, and they vary in shapes and sizes. Amine groups contain nitrogen in them, and carbohydrates do not have nitrogen in them, and so they cannot contain amine groups.

Detailed explanation-3: -Chemically, an amino acid is a molecule that has a carboxylic acid group and an amine group that are each attached to a carbon atom called the carbon.