Biology Cell membranes

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  • Created by: Chloesn
  • Created on: 10-04-14 21:36
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  • Chapter 2 Plasma Membranes
    • Fluid mosaic model
      • Glycolipids
      • Glycoproteins
      • Proteins
      • Channels
      • Cholesterol
      • Phospholipid bilayer
        • Phospolipid molecule
          • Head - Phosphate
            • Hydrophilic
          • Tail - lipid
      • Constant motion
      • Appearance from above
    • Cell signalling
      • Receptor
        • Acts an ion channel
        • Activates a G-protein
          • (Glycoprotein)
        • Acts as an enzyme
    • Movement
      • Osmosis
        • Water potential gradient
        • High to low
        • How much and pressure applied
        • Animal cell
          • High water potential = lysis
          • Low water potential = crenated
        • Plant cell
          • High water potential = turgid
          • Low water potential = Membrane pulls away
          • Plasmolysis
          • Balanced water potential = flaccid
      • Diffusion
        • Concentration gradient
        • Net movement of molecules and ions
      • Facilitated diffusion
      • Active transport
        • Requires ATP
        • Sodium-potassium pump
          • 2K+ in
          • 3Na+ out
        • Against concentration gradient
    • Exocytosis
      • Out of the cell
    • Endocytosis
      • Into the cell
        • Vesicle
          • Out of the cell
    • Temperature and permeablity
      • Heat = more permeable
        • Vibrate more = temporary gaps
      • Low temperature = decreased permeablity
        • Vibrate less = pack tightly
  • Hydrophobic
    • Tail - lipid

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