The difference between Guanine and Purine
When used as nouns, guanine means a substance first obtained from guano, whereas purine means any of a class of organic heterocyclic compounds, composed of fused pyrimidine and imidazole rings, that constitute one of the two groups of organic nitrogenous bases (the other being the pyrimidines) and are components of nucleic acids.
check bellow for the other definitions of Guanine and Purine
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Guanine as a noun (chemistry):
A substance first obtained from guano; it is a nucleic base and pairs with cytosine in DNA and RNA (by means of three hydrogen bonds).
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Purine as a noun (organic compound):
Any of a class of organic heterocyclic compounds, composed of fused pyrimidine and imidazole rings, that constitute one of the two groups of organic nitrogenous bases (the other being the pyrimidines) and are components of nucleic acids.