Nucleotides are the biomolecules comprising nitrogenous base sugar and a phosphate group in an arrangement Nucleotides are the basic unit of genetic material for all living organisms. It can be a base in another molecule, such as adenosine triphosphate (ATP). It is also found in coenzymes like NAD and NADP, that plays an important role in metabolism.  Another molecule that contains a nucleotide is cyclic AMP (cAMP), a messenger molecule.