C5 - Plasma Membranes

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  • Created by: Cpink15
  • Created on: 26-01-21 11:42
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  • Plasma membranes
    • Diffusion
      • simple
        • within fluids
        • osmosis
          • random movement of water
          • down gradient
            • partially permeable membrane
      • facilitated
        • large/polar molecules
        • through channel / carrier proteins
      • factors
        • temperature, concentration gradient, surface area, thickness
    • Active transport
      • carrier proteins used
        • SA effects rate
          • number effects rate
    • Structure + Function
      • partially permeable
        • exocytosis - releasing vesicles/ substances
          • endocytosis - taking in vesicles/ substances
      • phospholipid bilayer
        • 5-10nm thick
        • fluid mosaic model
      • gives rigidity
    • Permeability
      • factors
        • solvent conc, temperature, pH
        • colorimeter measures absorbance

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