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Stack #38256

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Question
Answer
active transport   process requiring energy by which cells move materials against a concentration gradient  
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contractile vacuole   organelle that some protists such as paramecium possess that collects and expels water  
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diffusion   net,random movement of particles from an area of high concentration to an area of low concentration  
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dynamic equilibrium   condition of continuous movemnet of particles across a gradient with no overall change in concentration  
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endocytosis   active transport of particles into a cell  
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exocytosis   active transport of particles out of a cell  
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facilitated diffusion   passive transport of particles such a sugars and amino acids across a membrane by way of transport proteins  
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fluid mosaic model   property of the plasma membrane wherein many similiar molecules are free to move sideways within their lipid bilayer  
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hypertonic solution   in cells the condition where the solution outside the cell is more concentrated than inside the cell-causes cells to shrink  
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hypotonic solution   in cells the condition where the solution outside the cell is less concentrated than inside the cell causing the cell to swell and possibly explode  
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isotonic solution   in cells the condition where the solution outside the cells is the same concentration as inside the cell  
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osmosis   the diffusion of water through a membrane depending on the concentration of solutes on either side of the membrane.  
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passive transport   in cells the movement of particles across a membrane requiring no expenditure of energy.ex-diffusion and osmosis  
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phospholipid   membrane lipids having phosphate groups attached to them.Plasma membranes of cells are made of these.  
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plasmolysis   process resulting in a drop in turgor pressure-ie. plants wilting  
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selective permeability   property of the plasma membrane where it controls what enters and exits the cell.  
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transport protein   a protein embedded in the cell membrane that can allow molecules to pass back and forth across the membrane  
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turgor pressure   internal pressure within a cell caused by water in the central vacuole  
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