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KEY Cell Membrane Images Instructions: For each image, determine an appropriate title and a description for what is happening in each. 1. Title: Diffusion • A form of passive transport • Net movement of molecules/ions toward regions where their concentrations are lower • High à Low 2. Title: Osmosis • Higher water potential • Lower water potential • Lower solute concentration • Higher solute concentration Title: _______________________________________________ • • Membrane is impermeable to solute. Net movement of water is from high water potential to low water potential. 3. Title: Osmosis Crenation ANIMAL PLANT _________________________________________________________________________ HYPOTONIC Solution ISOTONIC Solution HYPERTONIC Solution _________________________________________________________________________ _________________________________________________________________________ Net movement of water NO net movement Net movement of is from high to low of water. water is from high to _________________________________________________________________________ water potential and low water potential therefore INTO the and therefore OUT _________________________________________________________________________ cell. of the cell. _________________________________________________________________________ 4. Title: Facilitated diffusion ION CHANNEL FACILITATED DIFFUSION Transport of ions across a membrane in the direction of lower concentration of those ions. High à Low Molecules bind to a carrier protein on the extracellular side of the cell and pass through the plasma membrane by way of a conformational change in the carrier protein. High à Low 5. Title: Active Transport Movement of certain substances across the plasma membrane by ATP-powered transport proteins. These proteins can transport ______________________________________________________________________________ substances against their concentration gradients. ______________________________________________________________________________ 2 K in: 3 Na out ______________________________________________________________________________ + + Sodium-Potassium Pump 6. Title: Endocytosis/Exocytosis Endocytosis Process by which a cell surrounds and engulfs substances; portions of the plasma membrane turn inward and fuse, trapping a volume of extracellular liquid and its contents within a vesicle Exocytosis A vesicle merges with the plasma membrane and discharges its contents to the exterior 7. Title: Osmosis Solvent (H2O) Solute (ex:urea) Semipermeable membrane ______________________________________________________________________________ This is a U-tube osmometer. There will be a net movement of water is from high water potential to low water potential. ______________________________________________________________________________ ______________________________________________________________________________ 8. Title: Phagocytosis ______________________________________________________________________________ Phagocytosis is “cell-eating” or endocytosis of solid particles. ______________________________________________________________________________ This is a picture of an Amoeba eating a Chlamydomonas. Both the ______________________________________________________________________________ Amoeba and Chlamydomonas are protists.