Bio Strats # 11
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Created by:
cassiegosselin on June 10, 2010
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10 terms
Terms | Definitions |
|---|---|
 lipid bilayer | basic structure of a cell membrane; composed of two layers of phospholipids |
| diffusion | movement of molecules from high to low concentration across the lipid bilayer |
| osmosis | movement of water from high to low concentration across the cell membrane |
| concentration gradient | difference in the concentration of a substance on either side of the cell membrane |
| facilitated diffusion | movement of molecules from high to low concentration through protein channels in the cell membrane |
| active transport | movement of molecules from low to high concentration through protein channels requiring energy |
| protein channel | proteins embedded in the cell membrane that allow larger or charged molecules to pass through |
| equilibrium | equal distribution of molecules on both sides of the cell membrane |
| impermeable | inability of any molecules to pass through the cell membrane in either direction |
| semi-permeable | characteristic of the cell membrane which allows some molecules to pass through but not others |
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