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35 Cards in this Set
- Front
- Back
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what does a phospholipid compose of?
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2 fatty acid, hydrophobic heads and an alcohol hydrophilic head
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water packs many phospholipid molecules together to form a
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phospholipid bilayer
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phospholipid bilayer dont not allow any _____ ______ substances to enter throught th bilayer
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water soluble
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phospholipid bilayer contains ______ that provide passageways across emmbrane
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proteins
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the more the tails are _____, the less _____ like the bilayer becomes
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attracted
fluid |
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____ _____ _____ says that proteins float in fluid lipiid bilayer like a boat
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fluid mosaic model
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what are the 4 things that make up the cell membrane
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phospholipid bilayer
transmembrane proteins interior protein network cell surface markers |
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what do each of the components of the cell membrane do?
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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 |
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what are transmembrane proteins of the cell membrane made of? what do they do?
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carriers - escort molecules through membrane
channels - tunnel for passage receptors - transmit info in cell |
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what is the interior Protein network made of? what do they do?
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spectrins - shape of cell
clathrins - hold proteins in place, exterior of plasma membrane |
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Self-recognition
tissue recognition |
cell surface markers
glycoproteins glycolipids |
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transporters, enzymes, cell surface receptors, cell surface id markers, cell adhesion proteins,
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membrane proteins
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movement of substances from places of high conc. to low conc.
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diffusion
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______molecules cant pass through ______ interior of pho. lipid bilayer
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polar
nonpolar |
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movement across semi permeable to higher conc.
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osmosis
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dissolver
dissolved |
solvent
solute |
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concentration of all solutes in solution
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osmotic conc.
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higher conc. than something else
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hyperosmotic
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solution with low conc.
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hypoosmotic
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equal conc.
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isosmotic
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pressure of cytoplasm pushing out against the cell membrane
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hydrostatic pressure
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pressure needed to stop osmotic movemetn
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osmotic pressure
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animal cells need to stay ___ compared to environment because of plasma membrane
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isosmotic
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3 ways to maintain osmotic balance
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extrusion
isosmotic solutions turgor (plants) |
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as water enters, it is pumped out by vacuole that contracts; one way of maintaining osmotic balance
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extrusion
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fluid that bathes cells in isosmotic soluition; maintain osmotic balance
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isosmotic solution
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presses the plasma membrane agisnst the interior fo the cell wall, making rigid cell wall; is why plants stand up
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turgor pressure
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how plasma membrane envelops food particles
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endocytosis
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3 types of endocytosis
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phago - paritcle form
pinocytosis - liquid form receptor mediated endocytosis - bind to receptors; only for molecules that fit; turns into vesicle |
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discharge of material from vesicles at the cell surface
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exocytosis
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important in plant cells, exports material needed to make cell wall
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exocytosis
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moving up concentration gradients
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active transport
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describe 6 steps of sodium potasium pump.
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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 |
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The linked, simultaneous transport of two substances across a cell membrane
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coupled transport
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The chemical addition of a phosphate group (phosphate and oxygen) to a protein or another compound.
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phosphorylation
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