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Lecture 18

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Department
Biology
Course
BI110
Professor
Matthew Smith
Semester
Fall

Description
 Osmosis: The Passive Diffusion of Water  Net diffusion of water molecules across a selectively permeable membrane by diffusion  In response to differences in concentration of solute molecules  Selectively permeable membrane must allow water molecules to pass but not solute molecules  Moves from low solute concentration to high solute concentration  Solute concentration determines the rate of diffusion  Solute can be anything that can be dissolved in water  Tonicity  From hypotonic solution (lower concentrations of solute molecules), to hypertonic solution (higher concentrations of solute molecules  Always comparing solute concentrations  Solutions on each side are isotonic when the concentration is same on both sides  No osmotic movement of water in either direction  Active Membrane Transport  Active transport requires direct/indirect input of energy derived from ATP hydrolysis (or another source of energy)  Moves substances against their con
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