Bio lec 102 4

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Bio lec 102 4
2013-01-30 10:59:07
bio lipids membranes

quiz 1
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  1. Lipids
    • carbon containing compounds
    • Mostly nonpolar and hydrophobic
  2. 3 types of lipids in cells
    • fats
    • steroids
    • phospholipids
  3. Amphipathic
    contains both hydrophobic and hydrophilic domains. It's what phospholipids are
  4. Which phospholipid tail is more easily permeated?
    Unsaturated (results in bent tails) and short tails
  5. Does temperature effect permability?
    yes. Higher temperatures result in higher permeability.
  6. Solute
    small ion or molecule in solution
  7. diffusion
    Random movement of solutes... There is a random movement of solution resulting in equilibrium or evenness through out.
  8. Osmosis
    Movement of water that occurs when uneven solutions are seperated by permeable membrane.
  9. hypertonic
    high concentration outside of cell
  10. hypotonic
    high concentration inside the cell
  11. isotonic
    ideal... equal concentration and no water loss/gain
  12. Phospholipids
    form basic structure of membrane and isolate it from environment
  13. Proteins (in cell membrane)
    they do the work and form the channels to import things in and out of the cell
  14. Fluid mosaic model
    proteins embedded within lipid bilayer
  15. Unsaturated lipids
    results in bent tails making them more permeable. (think oil).. Shit's easy to get through.
  16. Saturated
    (think butter) Results in longer straighter tails that are not as easily permeated.
  17. Concentration Gradient
    Difference in solute concentration.
  18. Equilibrium
    When solution is mixed enough to be the same throughout. (movement still occurs even after equilibrium is achieved)
  19. Integral
    • Membrane proteins that are inserted into the lipid bilayer and are hydrophobic
  20. Peripheral
    These are attached to one side of bilayer.
  21. 2 types of channel transport
    • –Facilitated
    • diffusion

    • –Active
    • transport
  22. Facilitated diffusion
    • •Movement of molecules WITH gradient
    • through channel

    • •No energy required (1 type of
    • passive transport)
    • Needs protein carrier
  23. Active transport
    • •Transport of molecules or ions
    • AGAINST gradient

    •Requires energy (ATP)