Biology Ch.5 Cell Membrane

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Anonymous
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74431
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Biology Ch.5 Cell Membrane
Updated:
2011-03-22 03:09:51
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Biology Cell Membrane
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Cell Membrane
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  1. Cell Membrane Structure and Components
    • 1. Phospholipid Bilayer: 2 layers of phosphate and fat
    • - Phosphate is hydrophillic
    • - lipid is hydrophobic
    • 2. Protein- embedded in layer
  2. Cell Membrane Protein Components
    • Glycoprotein- used for cell-to-cell communication, carb identification
    • Receptors- to send/recieve messages
    • Enzymes- catalyze reaction
    • Transporter- transport substances
  3. What do Transport Proteins depend on?
    Concentration Gradient (must have in order to be transported)
  4. Small Molecule Transportation (explanation)
    • Uses "Passive Transport": moves substances from high concentration to low concentration (moving down gradient)
    • Strives to reach equlibrium
    • NO ENERGY REQUIREMENT
  5. Types of "Passive Transport"
    • Diffusion- movement of hydrophobic substances
    • Osmosis- diffusion of WATER across semipermiable membrane
  6. 3 Types of Osmosis "Tonicity"
    • Isotonic- solute concentration is equal between cell and solution (outside of cell)
    • Hypotonic- solute concentration of solution (outside of cell) is LOWER than cell
    • Hypertonic- solute concentration of solution (outside of cell) is higher than cell
  7. Osmosis Tonicity Diagram
  8. Osmosis "Tonicity" (def)
    Ability of solution to make cell Gain or Lose water.
  9. Facilitated Diffusion
    • Uses transport protein and moves hydrophillic substances
    • Aquaporins- proteins that move water
  10. Active Transport (explanation)
    • Movement is Low to High "against gradient"
    • REQUIRES ENERGY
    • REQUIRES TRANSPORT PROTEINS
  11. Large Molecule Transportation
    • Exocytosis- Exporting out cell (EXIT)
    • Endocytosis- Importing into cell (ENTER)

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