Bacterial
Microorganism
Stucture
Bacteria
as
seen
later,
can
be
broadly
divided
into
two
major
groups
based
on
their
Gram
staining
characteristics
such
as
Gram
positive
and
Gram
negative.
The
Gram
staining
technique,
the
most
widely
used
differential
staining
technique
employed
in
bacteriology
was
first
developed
by
Christian
Gram
in
the
19th
century
and
is
used
primarily
to
divide
bacteria
into
two
broad
groups.
The
general
features
of
the
Gram-positive
and
Gram-negative
bacteria
.
Most
bacteria
have
at
least
two
structures
around
the
cytoplasm
namely
the
cell
wall
(envelope)
and
the
cytoplasmic
membrane.
Some
may
have
additional
components
such
as
the
outer
membrane
as
in
the
Gram-negative
bacteria,
a
capsule
and
slime.
Some
bacteria
which
are
motile
have
surface
appendages
with
the
aid
of
which
they
can
move
In
addition,
some
others
such
as
the
Gram-negative
bacteria
have
short
hair
like
structures
called
the
pili
(fimbriae).
These
are
not
essential
for
the
growth
and
survival
of
the
bacterial
cells.
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