LIFE SCIENCE

Detailed explanation-1: -Nitrogen is found in two of these macromolecules-proteins and nucleic acids.

Detailed explanation-2: -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-3: -Nitrogen is in all amino acids and nucleotides, and therefore in all proteins and nucleic acids.

Detailed explanation-4: -Amino nitrogen accounts for approximately 16% of the weight of proteins. Amino acids are required for the synthesis of body protein and other important nitrogen-containing compounds, such as creatine, peptide hormones, and some neurotransmitters.