BIOMOLECULES AND ENZYMES

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

Detailed explanation-3: -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-4: -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-5: -Answer and Explanation: The correct answer: The element which is not found in proteins is D) Water. The protein structures are formed with the help of amino acid strands. The amino acid is formed with the elements carbon, hydrogen, oxygen, and nitrogen as part of the basic structure with some other elements as well.