BIOL1401 Exam 2 Review

BIOL1401 Exam 2 Review - Exam 2 Review Chapter 9 Diffusion...

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Exam 2 Review Chapter 9 Diffusion is the movement of molecules from high concentration to low concentration. Moving lower to higher is moving against the concentration gradient. Osmosis is the diffusion of water through a semi-permeable membrane. KEY is that water moves from lower concentration to higher, opposite of regular diffusion. Osmotic Pressure is the pressure to prevent osmosis. Turgor Pressure is the pressure that develops against the cell walls and results in water entering the cells. Plasmolysis is the loss of water through osmosis. When photosynthesis occurs, the stomata opens and water enters the guard cell; when it does not occur, stomata closes and water leaves the guard cells. Stomata of most plants are opened during the day and closed during the night time. Pressure-Flow Hypothesis is when organic solutes flow from source, where water enters by osmosis and to the source, where food is utilized and water exits.
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