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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.
All organic compounds be generally classified as hydrocarbons (molecules containing only hydrogen and carbon) or substituted hydrocarbons (molecules having one or more hydrogen atoms replaced by another atom or group of atoms).. Carbon can form double and triple bonds with other carbon atoms or other elements. 4. Carbon can bond with itself either as straight chains or cyclic compounds with branching possible in either case. Two different organic compounds can also have the same number of carbon atoms. These are called isomers.