EVPP 110 Lecture - Matter and Energy - Membranes Diffusion Lifes Building Blocks - Student - Fall 20

Diffusion and osmosis osmosis special case of

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Diffusion and Osmosis Osmosis Special case of diffusion Movement of water across semi-permeable membrane Hypertonic = higher concentration of solutes Hypotonic = lower concentration of solutes Isotonic = equal concentration of solutes
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Solute Low Solute Concentration High Solute Concentration Solution A Solution B Solution A is hypotonic relative to solution B Solution B is hypertonic relative to solution A
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Effect of osmosis on cells Animal cell Plant cell
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iClicker Question #6 If you place an animal cell into a hypertonic solution, what will happen? A. the cell will gain water B. the cell will lose water C. there will be no net gain or loss of water
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Diffusion and Osmosis Facilitated diffusion Still passive, gets help
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Active Transport Active transport Requires input of energy Movement against concentration gradient Low conc High conc Direction of movement
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iClicker Question #7 Does active transport require an input of energy? A. no B. yes
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Life’s building blocks Organic molecule/compounds Contains carbon, usually made by cells Hydrocarbons Composed only of carbons and hydrogens
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Life’s Building Blocks Macromolecules “big” molecules Polymers
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  • Fall '08
  • all
  • Osmosis, iClicker Question, Leaky cell membrane, plasma membrane

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