MEMBRANE STRUCTURE
AND FUNCTION
, MEMBRANE STRUCTURE AND FUNCTION
membranes (phospholipid bilayers) create compartments in cells and separation between
cell and environment
↳ make
multiple simultaneous chemical processes possible
-
> "division of labor" makes
all more efficient and adaptable
membrane components in cell also include protein molecules (partially or
completely
embedded in membrane
cholesterol is lipid in animal plasma membrane
(analogous steroids for plant membrane
↳
helps
modify fluidity of membrane over
range
of temperatures
phospholipids =
ampiphatic molecules
hydrophobic hydrophilic region
↳ have and
↳
form
bilayer in
water
reason
why they
↳
polar molecules (outside of all
hydrophilic polar heads associate with water
get away from polar water
hydrophobic nonpolar tails associate with each other
↳ -
similar in of molecules makes them
membranes
very types they contain -
interchangeable and makes
fusing together easy
might differ-integral proteins (are
↳
embedded scattered
proteins that are
through
pattern from membrane
it in
irregular ,
can
vary
membrane to
Peripheral Proteins side of membrane
proteins that
only occur of
Cytoplasmic
=
most
integral proteins go through
whole membrane , some
only protrude from
one side
↳ associates with of membrane
hydrophobic core
region nonpolar core
↳
protrude from both surfaces of polar
hydrophilic bilayer
ends -
interact with
water molecules
↳ held in
by fibers exoskeleton and
place attachements to protein on inside
by
:
- have ECM contains protein
outside
by extracellular matrix
only animals ,
fibers and
large , complex
Carbohydrates
AND FUNCTION
, MEMBRANE STRUCTURE AND FUNCTION
membranes (phospholipid bilayers) create compartments in cells and separation between
cell and environment
↳ make
multiple simultaneous chemical processes possible
-
> "division of labor" makes
all more efficient and adaptable
membrane components in cell also include protein molecules (partially or
completely
embedded in membrane
cholesterol is lipid in animal plasma membrane
(analogous steroids for plant membrane
↳
helps
modify fluidity of membrane over
range
of temperatures
phospholipids =
ampiphatic molecules
hydrophobic hydrophilic region
↳ have and
↳
form
bilayer in
water
reason
why they
↳
polar molecules (outside of all
hydrophilic polar heads associate with water
get away from polar water
hydrophobic nonpolar tails associate with each other
↳ -
similar in of molecules makes them
membranes
very types they contain -
interchangeable and makes
fusing together easy
might differ-integral proteins (are
↳
embedded scattered
proteins that are
through
pattern from membrane
it in
irregular ,
can
vary
membrane to
Peripheral Proteins side of membrane
proteins that
only occur of
Cytoplasmic
=
most
integral proteins go through
whole membrane , some
only protrude from
one side
↳ associates with of membrane
hydrophobic core
region nonpolar core
↳
protrude from both surfaces of polar
hydrophilic bilayer
ends -
interact with
water molecules
↳ held in
by fibers exoskeleton and
place attachements to protein on inside
by
:
- have ECM contains protein
outside
by extracellular matrix
only animals ,
fibers and
large , complex
Carbohydrates
