Cell Membrane In Depth Flashcards
Cell membrane also called the
plasma membrane
cell membrane is made up of
phosopholipids, proteins, sugars, and cholesterol
fluidity
parts of the membrane able to move around
steroids
another type of lipid even though they look different
steroids are
nonpolar
cholesterol
a steroid that helps maintain the structure of an animal cell membrane
Proteins play
a variety of roles in the cell membrane
receptors
protein function
receiving signals
transport proteins
protein function
move molecules across the membrane
channels
protein function
act as doorways
glycoproteins
protein function
act as ID tags
Prokaryotes and plants DO NOT
have cholesterol in their cell membranes
molecules are always
moving
molecules can move at different speeds depending on
phase and temperature
Concentration Gradient
unequal distribution of particles in a given space
equilibrium
molecules will move until they achieve equilibrium. it is the equal distribution of particles in a given space
passive transport
does not require energy
movement of molecules from high to low trans
purpose: equilibrium
types: diffusion, osmosis, facilitated diffusion
diffusion
the movement of ANY particle from high to low concentration
osmosis
the movement of WATER from high to low concentration across a membrane
hypotonic
less solute outside (more water)
isotonic
equal concentration of solute
hypertonic
more solute outside
less water
water always moves from
hypo to hyper
why do animal cells explode when plant cells dont during hypotonic
plant cell walls allow it not to burst
facilitated diffusion
movement of particles from high to low concentrations across the cell membrane with the aid of special membrane transport proteins
