NEET BIOLOGY

Detailed explanation-1: -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-2: -Amino acids contain at least one nitrogen (amino) atom, which makes them different from carbohydrates. However, some carbohydrates like glucosamine and mucopolysaccharides do contain nitrogen atoms. The carbohydrates might have a nitrogen atom, but amino acids and proteins always have nitrogen atoms.

Detailed explanation-3: -Nitrogen is in all amino acids and nucleotides, and therefore in all proteins and nucleic acids.

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.