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5nucleotides

Five nucleotides refers to the five canonical nucleobases that encode genetic information in living organisms: adenine (A), cytosine (C), guanine (G), thymine (T), and uracil (U). DNA uses A, C, G, and T, while RNA uses A, C, G, and U; when considering both DNA and RNA together, five distinct bases are recognized.

Each nucleotide consists of a sugar molecule (deoxyribose in DNA, ribose in RNA) attached to a phosphate

Nucleotides function not only as the monomers of nucleic acids but also as energy carriers and signaling

group
and
a
nitrogenous
base.
The
bases
are
subdivided
into
purines
(adenine
and
guanine)
and
pyrimidines
(cytosine,
thymine,
uracil).
Base
pairing
follows
Watson-Crick
rules:
A
pairs
with
T
in
DNA
and
with
U
in
RNA,
forming
two
hydrogen
bonds;
C
pairs
with
G
with
three
hydrogen
bonds.
This
complementarity
underpins
the
structure
of
double-stranded
DNA
and
the
transcriptional
processes
in
cells.
molecules,
with
ATP
and
other
nucleotide
triphosphates
driving
metabolism,
and
cyclic
nucleotides
acting
as
second
messengers.
The
selection
of
these
bases
is
central
to
genetic
encoding,
replication
fidelity,
and
the
evolution
of
biochemistry
across
life.