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nucleotide
noun
(biochemistry)
The
monomer
constituting
DNA
or
RNA
biopolymer
molecules.
Each
nucleotide
consists
of
a
nitrogenous
heterocyclic
base
(or
nucleobase),
which
can
be
either
a
double-ringed
purine
or
a
single-ringed
pyrimidine;
a
five-carbon
pentose
sugar
(deoxyribose
in
DNA
or
ribose
in
RNA);
and
a
phosphate
group.