The difference between Guanine and Nucleobase
When used as nouns, guanine means a substance first obtained from guano, whereas nucleobase means the base of a nucleic acid, such as thymine, uracil, adenine, cytosine and guanine.
check bellow for the other definitions of Guanine and Nucleobase
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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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Nucleobase as a noun (biochemistry):
The base of a nucleic acid, such as thymine, uracil, adenine, cytosine and guanine.