A nitrogenous base found inDNA and RNA. It is also a constituent ofcertain coenzymes,e. g. NAD and FAD,and when combined with the sugar ribose itforms the nucleoside adenosine found inAMP,cAMP,ADP,and ATP. Adenine hasa purine ring structure. See also DNA.......(本文共 314 字, 1 张图) [阅读本文] >>