Another one of these compounds is acted upon by its namesake oxidase in the biosynthesis of hydrogen peroxide.
Mutating one copy of a gene responsible for the production of one of these specific compounds leads to the accumulation of a red pigment in the red/white yeast color assay. A certain deÂ·aminase enzyme catalyzes the formation of IMP from one of these compounds in the first step of a cytoplasmic pathway that generates fumarate from aspartate, and is named for this class of compound. Another one of these compounds is acted upon by its namesake oxidase in the biosynthesis of hydrogen peroxide. That enzyme, (*) xanthine oxidase, is also the target of the anti-gout medication Zyloprim because the common end product for the catabolism of these compounds is uric acid. These compounds are formed from the fusion of an imidazole ring to a similar class of cyclic compounds. For 10 points, name these aromatic heterocycles exemplified by adenine and guanine. 
Mutating one copy of a gene responsible for the production of one of these specific compounds leads to the accumulation of a red pigment in the red/white yeast color assay.
purines [prompt on "nucleotides" or "nucleobases"; anti-prompt on specific purines like "adenine", "guanine", or "xanthine"]