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Nitrogen occurs in all organisms, primarily in amino acids (and thus proteins), in the nucleic acids (DNA and RNA) and in the energy transfer molecule adenosine triphosphate. The human body contains about 3% by mass of nitrogen, the fourth most abundant element in the body after oxygen, carbon, and hydrogen.
â¢ Part II: To classify, recognize and construct models of different types of isomers of organic compounds. Background Almost all compounds that contain carbon atom(s) are known as organic compounds. Most organic compounds also contain hydrogen atom(s). Organic compounds that contain only carbon and hydrogen atoms are classified as hydrocarbons. Some organic compounds also contain other nonmetals (referred to as heteroatoms) such as oxygen, nitrogen, the halogens, sulfur, and phosphorus.