Zusammenfassung der Ressource
Cell Membranes
- plasma membranes
- fluid mosaic model
- proteins move
around the
mosaic of
phospholipids
- phospholipids
- form a bilayer
through which
certain substances
can pass
- carbon dioxide
- oxygen
- small lipids
- hydrophilic head that
points out,
hydrophobic fatty
acid tail that points
in
- cholesterol binds to the tails
- pack closer together
- resist effects of
temperature change
- membrane
becomes less
fluid and more
rigid
- intrinsic proteins
- channel proteins
- allow passive movement
of ions and molecules
- carrier proteins
- change shape to carry
specific molecules by
passive or active
transport
- extrinisic proteins
- may be attached to carrier proteins
- functions as
- antigen
- enzyme
- receptor site for
hormone (signalling
molecule)
- glycocalyx
- glycoproteins
- form hydrogen
bonds with water to
add stability
- help cells adhere together
- cell signalling
- act as receptor molecules
for binding of
hormones/neurotransmitters
- insulin receptors in liver or muscle
- acetylcholine at nerve synapses
- glycolipids
- antigens that allow cells
to recognise each other
as self or non-self
- white blood cells