Term
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Definition
| allows some substances to enter while preventing others from entering |
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Term
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Definition
| having both a hydrophobic and hydrophilic side |
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Term
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Definition
| name given to the plasma membrane due to the many protein molecules bobbing in a double layer of phospholipids |
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Term
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Definition
| transmembrane proteins with hydrophobic regions that completely span the membrane |
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Term
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Definition
| proteins not embedded inthe lipid bilayer, but are loosely bound to the surface of the membrane often to the exposed part of integral proteins |
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Term
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Definition
| integral protein that allows passage of ions and polar molecules into and out of the cell |
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Term
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Definition
| tendancy of molecules to spread out into the available space in an attempt to reach equilibrium |
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Term
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Definition
| areas were there is a difference in concentration from one area to the next |
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Definition
| transport that requires no energy expenditure (osmosis, facilitated diffusion, simple diffusion) |
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Term
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Definition
| higher solute concentration |
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Term
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Definition
| lower solute concentration |
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Term
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Definition
| equal solute concentration |
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Term
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Definition
| passive transport of water across a membrane |
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Term
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Definition
| control of water balance of animals without cell walls as their internal solute concentration attempts to equalize with the external environment's solute concentration |
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Definition
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Term
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Definition
| limp plant cell (wilting) |
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Term
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Definition
| losing water to the surroundings, shriveling of cells |
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Term
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Definition
| polar molecules and ions getting assistance to cross the plasma membrane by way of an integral protein |
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Term
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Definition
| passage of particles across the membrane that requires energy |
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Term
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Definition
| type of active transport that exchanges Na+ ions for K+ ions across an animal membrane |
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Term
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Definition
| voltage across a cell membrane (-50 to -200 mV) |
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Term
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Definition
| diffusion gradient of an ion |
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Term
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Definition
| transport protein that generates voltage across a membrane |
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Term
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Definition
| main electrogenic pump of plants, bacteria, and fungi. Actively transports H+ ions out of the cells |
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Term
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Definition
| the coupling of the downhill diffusion of one substance to the uphill tranport of another against its concentration gradient |
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Term
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Definition
| fusion of vesicles with the plasma membrane resulting in the secretion of materials outside the cell |
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Term
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Definition
| cells taking in macromolecules by forming new vesicles from the plasma membrane |
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Term
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Definition
| cellular eating-engulfing a large particle of food |
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Term
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Definition
| cell gulping of droplets of extracellular fluid in tiny vesicles |
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Term
| receptor mediated endocytosis |
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Definition
| protein receptors embedded in the p. membrane bind molecules and then form vesicles to bring them into the cell |
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Term
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Definition
| extracellular substances that bind to receptors on the plasma membrane |
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