Unlike carbohydrates and lipids, proteins contain the nitrogen (N) element. Largemacromoleculescalled proteins are made ofamino acids, which must all contain nitrogen.Each amino acid has a corecarbon atomattached to an R-group, an amino group (-NH2), a carboxyl group (-COOH), a hydrogen atom, and other side chains. Differentamino acidsmay have different R-groups, which gives them unique chemical characteristics. Since nitrogen can be found in the amino group of all amino acids, it is an important component of the structure and composition of proteins.Learn more aboutamino acids, here:brainly.com/question/31872499#SPJ6...

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