BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Since both the functional groups are attached to the a-carbon so they are called a-amino acids. So, nitrogen is only present in proteins and not in carbohydrates and lipids.

Detailed explanation-2: -Answer and Explanation: Nitrogen is not present in fats and carbohydrates. Fats and carbohydrates contain carbon, hydrogen and oxygen atoms. Proteins contain nitrogen and smaller amounts of carbon and hydrogen atoms.

Detailed explanation-3: -Proteins, carbohydrates and lipids are made from three basic molecules: carbon, hydrogen and oxygen. However, all proteins contain an element not found in carbohydrates and lipids is nitrogen.

Detailed explanation-4: -The common attributes of carbohydrates are that they contain only the elements carbon, hydrogen and oxygen, and that their combustion will yield carbon dioxide plus one or more molecules of Water.