Stack #38256
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| 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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