Guanine is a nitrogenous base which is present in the genetic material (DNA and RNA). It is an organic compound and belongs to the category of purines. Purines have two aromatic rings fused together. The rings consist of carbon, hydrogen and nitrogen atoms. Guanine forms three hydrogen bonds with another nitrogenous base, cytosine which has only one ring and belongs to the class of pyrimidines.
This nitrogenous base is quite complex and versatile due to its wide variety of biological uses. The species like spiders, scorpions and amphibians metabolize the proteins and form ammonia which is afterwards converted into guanine. This is done to minimize the water loss from the body.
