AP BIOLOGY

Detailed explanation-1: -Nitrogen is found in two of these macromolecules-proteins and nucleic acids. The molecular building blocks of proteins are amino acids, of which nitrogen is a fundamental component. Nucleic acids include RNA (ribonucleic acid) and DNA (deoxyribonucleic acid).

Detailed explanation-2: -Nitrogen is in all amino acids and nucleotides, and therefore in all proteins and nucleic acids.

Detailed explanation-3: -Just like carbohydrates and fats, proteins contain the elements carbon, hydrogen, and oxygen, but proteins are the only macronutrient that also contain nitrogen as part of their core structure.

Detailed explanation-4: -Lipids are composed mainly of carbon and hydrogen, but they can also contain oxygen, nitrogen, sulfur, and phosphorous.