Nitrogen
Bases
of
DNA -
These
are
rather
complex
single
or
double
ring
structures
containing
nitrogen
and
are
attached
to
the
carbon
of
the
sugar.
Nitrogen
bases
are
of
two
types
based
on
the
number
of
rings.
Purines
Purines
are
double
ringed
nitrogenous
bases
which
are
linked
to
sugar
by
using
nitrogen
present
at
9'
-position.
Adenine
and
guanine
come
under
this
group.
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