nucleic acids are important intracellular signaling molecules and coenzymes are the single most important means of coupling endergonic to exergonic reactions and are the storage of genetic information in the form of dna and rna. the latter is composed of nucleotides containing a phosphoribosyl component and either one of the aromatic base adenine ,guanine , cytosine,and uracyl. these bases can be distinguished by their nitrogen containing aromatic ring structures and come in two forms - pyrimidines and purines.