Science Fair Project Encyclopedia A nucleotide is an organic
molecule consisting of a nitrogenous heterocyclic nucleobase (a
purine or a pyrimidine), a pentose sugar (deoxyribose in DNA or
ribose in RNA), 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. Articles in category
"Nucleotides"There are 17 articles in this category. The
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