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35 Cards in this Set

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what does a phospholipid compose of?
2 fatty acid, hydrophobic heads and an alcohol hydrophilic head
water packs many phospholipid molecules together to form a
phospholipid bilayer
phospholipid bilayer dont not allow any _____ ______ substances to enter throught th bilayer
water soluble
phospholipid bilayer contains ______ that provide passageways across emmbrane
proteins
the more the tails are _____, the less _____ like the bilayer becomes
attracted
fluid
____ _____ _____ says that proteins float in fluid lipiid bilayer like a boat
fluid mosaic model
what are the 4 things that make up the cell membrane
phospholipid bilayer
transmembrane proteins
interior protein network
cell surface markers
what do each of the components of the cell membrane do?
phosphlipid bilayer - permeability barrier

Transmembrane proteins -
allow substnaces and info to cross the membrane
int. protein network -
hold cell shape
Cell surface markers
self recognition
tissue recognition
what are transmembrane proteins of the cell membrane made of? what do they do?
carriers - escort molecules through membrane

channels - tunnel for passage

receptors - transmit info in cell
what is the interior Protein network made of? what do they do?
spectrins - shape of cell
clathrins - hold proteins in place, exterior of plasma membrane
Self-recognition
tissue recognition
cell surface markers
glycoproteins
glycolipids
transporters, enzymes, cell surface receptors, cell surface id markers, cell adhesion proteins,
membrane proteins
movement of substances from places of high conc. to low conc.
diffusion
______molecules cant pass through ______ interior of pho. lipid bilayer
polar
nonpolar
movement across semi permeable to higher conc.
osmosis
dissolver

dissolved
solvent

solute
concentration of all solutes in solution
osmotic conc.
higher conc. than something else
hyperosmotic
solution with low conc.
hypoosmotic
equal conc.
isosmotic
pressure of cytoplasm pushing out against the cell membrane
hydrostatic pressure
pressure needed to stop osmotic movemetn
osmotic pressure
animal cells need to stay ___ compared to environment because of plasma membrane
isosmotic
3 ways to maintain osmotic balance
extrusion
isosmotic solutions
turgor (plants)
as water enters, it is pumped out by vacuole that contracts; one way of maintaining osmotic balance
extrusion
fluid that bathes cells in isosmotic soluition; maintain osmotic balance
isosmotic solution
presses the plasma membrane agisnst the interior fo the cell wall, making rigid cell wall; is why plants stand up
turgor pressure
how plasma membrane envelops food particles
endocytosis
3 types of endocytosis
phago - paritcle form
pinocytosis - liquid form
receptor mediated endocytosis - bind to receptors; only for molecules that fit; turns into vesicle
discharge of material from vesicles at the cell surface
exocytosis
important in plant cells, exports material needed to make cell wall
exocytosis
moving up concentration gradients
active transport
describe 6 steps of sodium potasium pump.
3 na+ ion bind to cytoplasmic side of protein

protein binds molcule of atp, adp released

na+ transported across membrane to exterior


2 K+ slide in

dephophorylation of protein

Na+ given off K+ taken in
The linked, simultaneous transport of two substances across a cell membrane
coupled transport
The chemical addition of a phosphate group (phosphate and oxygen) to a protein or another compound.
phosphorylation