EVERYDAY SCIENCE

Detailed explanation-1: -Proteins and nucleic acids are the most common nitrogen-containing macromolecules. Amino acids with an amine group are used to make proteins. Nitrogen is arranged in a ring shape in DNA and RNA. Proteins and nucleic acids are hence nitrogen-containing biomolecules.

Detailed explanation-2: -Nitrogen in the reduced form is the major component of the three most important biological macromolecular structures: (i) proteins/polypeptides, (ii) DNA and RNA, and (iii) polymers of amino sugars.

Detailed explanation-3: -Nitrogen is in all amino acids and nucleotides, and therefore in all proteins and nucleic acids. Nitrogen is also a major component of the chitin that makes up the cell walls of fungi and the exoskeletons of aquatic insects and crustaceans.

Detailed explanation-4: -A: All biochemical compounds contain carbon, hydrogen, and oxygen; and proteins as well as nucleic acids contain nitrogen.

Detailed explanation-5: -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.