base pair
Definition of base pair
base´ pair`
Pronunciation:
bās´ pâr`
n.
1.
(Biochemistry, Genetics)
a
unit
of
double-stranded
DNA
or
RNA
consisting
of
two
complementary
bases
on
opposing
strands
of
the
double-stranded
polynucleotide
,
bound
together
by
hydrogen
bonds
and
other
non-covalent
chemical
forces
.
The
bases
comprising
the
base
pairs
are
adenine
,
thymine
,
cytidine
,
and
guanine
.
In
normal
DNA
,
the
base
adenine
on
one
strand
of
DNA
pairs
with
thymine
on
the
opposite
strand
,
and
cytosine
on
one
strand
pairs
with
guanine
on
the
opposite
strand
.
The
term
base
pair
usually
includes
the
sugar
(
ribose
or
deoxyribose
)
and
the
phosphate
bound
to
each
base
to
form
a
nucleotide
unit
.
One
base
pair
is
sometimes
used
as
a
unit
of
length
or
size
for
DNA
,
and
in
this
usage
is
abbreviated
bp
;
as
,
a
100-bp
fragment
of
DNA
.
A
length
of
1000
base
pairs
is
a
kilobase
pair
or
kbp
.
Related Words
deoxyribonucleic
acid
,
desoxyribonucleic
acid
,
DNA
,
nucleotide
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