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24 Cards in this Set
- Front
- Back
plasma membrane
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structure that separates the living cell from it's non-living environment
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phospholipid bilayer
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controls trafic in and out of the cell
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integral protein
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TRANSmembrane with hydrophobic regions that span the hydrophobic interior of the membrane
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periferal protein
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proteins attached to the membrane surface
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integral protein functions
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transport, intercellular joining, enzymatic activity, signal transduction, attachment to the cytoskeleton and ECM
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selectively permeable
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property of biological membranes that allows some substances to cross more easily than others
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transport proteins
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integral membrane proteins (IMPs) that transport specific molecules or ions across biological membranes
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Diffusion
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action of molecules of any substance spreading out in available space
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concentration gradient
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difference in the concentration of molecules as compared between two areas in the solution
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net directional movement
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overall movement AWAY from an area of high concentration
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passive transport
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diffusion - no energy requires, due to random molecular movement
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osmosis
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diffusion of water across a selectively permeable membrane due to the differences of concentration of solutions on each side
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hypertonic
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solution that has a higher solute concentration than the solute concentration found inside of the cell
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hypotonic
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solution that has a lower solute concentration than the solute concentration found inside of the cell
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isotonic
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solution that has an equal solute concentration than the solute concentration found inside of the cell
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osmotic concentration
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total solute concentration of a solution
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osmotic pressure
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pressure exerted by water flowing into a hypertonic solution across a selectively permeable membrane
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reverse osmosis
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the reversal of osmosis by exerting more pressure on the hypertonic side of a selectively permeable membrane
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turgid
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swollen
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flaccid
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soft
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plasmolysed
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Shrinkage of the protoplasm away from the wall of a living plant or bacterial cell, caused by loss of water through osmosis
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facilitated diffusion
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diffusion of solutes across a membrane with the help of transport proteins
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aquaporin
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water protein channel
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active transport
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use of energy to transport a molecule through a transport protein agains the concentration gradient - requires ATP
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