Anucleotide is an organic molecule consisting of a nitrogenous heterocyclic nucleobase (apurine or a pyrimidine), a pentose sugar (deoxyriboseinDNAorriboseinRNA), and a phosphate or polyphosphate group. As a short-hand, the nucleotides that form the rungs of the ladder in the DNA double-helix are often referred to by biologists, as their base pair identity such as adenine (A), see Category:Purines and Category:Pyrimidines.
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