AP Biology Concentration of water Direction of osmosis is determined by

Ap biology concentration of water direction of

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AP Biology Concentration of water Direction of osmosis is determined by comparing total solute concentrations Hypertonic - more solute, less water Hypotonic - less solute, more water Isotonic - equal solute, equal water hypotonic hypertonic water net movement of water
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AP Biology freshwater balanced saltwater Managing water balance Cell survival depends on balancing water uptake & loss
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AP Biology Managing water balance Hypotonic a cell in fresh water high concentration of water around cell problem : cell gains water, swells & can burst example : Paramecium ex: water continually enters Paramecium cell solution : contractile vacuole pumps water out of cell ATP provides the power. plant cells turgid = full cell wall protects from bursting freshwater ATP 1 No problem, due to support of cell wall Lyse
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AP Biology Pumping water out Contractile vacuole in Paramecium ATP
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AP Biology Managing water balance Hypertonic a cell in salt water low concentration of water around cell problem : cell loses water & can die example : shellfish solution : take up water or pump out salt plant cells plasmolysis = wilt can recover saltwater 2 I will survive ! I’m plasmolyzing !
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AP Biology Managing water balance Isotonic animal cell immersed in mild salt solution no difference in concentration of water between cell & environment problem : none no net movement of water flows across membrane equally, in both directions cell in equilibrium volume of cell is stable example : blood cells in blood plasma slightly salty IV solution in hospital balanced 3 I could be better… More H2O please ! That’s perfect !
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AP Biology Aquaporins Water moves rapidly into & out of cells evidence that there were water channels protein channels allowing flow of water across cell membrane 1991 | 2003 Peter Agre John Hopkins Roderick MacKinnon Rockefeller
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AP Biology Cell (compared to beaker) hypertonic or hypotonic Beaker (compared to cell) hypertonic or hypotonic Which way does the water flow? in or out of cell .05 M .03 M Do you understand Osmosis…
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AP Biology Any Questions??
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  • Fall '16
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  •  Salts,  Membrane

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