Membrane
Transport
Membrane
Transport -
In
gram
negative
bacteria
the
cell
envelope
consists
of
an
outer
membrane
(cell
wall)
and
an
inner
membrane
(cytoplasmic
membrane),
with
a
space,
called
the
periplasmic
space,
between
the
two
membranes
In
this
space
is
a
peptidoglycan
layer.
The
outer
membrane
acts
as
a
barrier
to
the
passage
of
some
substances,
including
proteins
and
number
of
antibiotics.
The
functions
of
the
inner
membrane
include
biosynthesis
of
structural
membrane
components
like
phospholipids,
murein
(mucopeptid
and
peptidoglycan),
lipopolysaccharides
and
polysaccharides,
attachment
of
DNA,
control
of
chemotaxis,
elctron
transport
and
oxidative
phosphorylation
and
transport
of
nutrients
and
ions.
The
cell
envelope
of
gram
positive
bacteria
consists
of
a
peptidoglycan
wall,
underlying
which
is
the
cytoplasmic
membrane.
The
major
features
of
the
cytoplasmic
membrane
are
explained
by
the
fluid
mosaic
model
of
Singer
and
Nicolson.
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