Movement across the membrane

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MrsG
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71047
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Movement across the membrane
Updated:
2011-03-06 14:39:12
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diffusion osmosis active transport facilitated diffusion saucon valley high school
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Everything covered in Unit 2 "movement across the membrane" lectures
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  1. what is the name for the double layered sheet structure that makes up the cell membrane?
    lipid bilayer
  2. The control of particle movement across a membrane
    Seletive permeability
  3. What is the reason that oxygen can pass freely through a membrane but sodium requires effort?
    the membrane is selectively permeable
  4. Why is it called a Membrane Mosiac Model?
    Many molecules make up the structure of the membrane that it is called a "mosiac"
  5. Proteins that are permanently connected to the membrane and go from one side to the other..
    Integral Proteins
  6. Proteins that allow ions to pass through the membrane down their concentration gradient
    Channel proteins
  7. Proteins that change their shape to help facilitate diffusion down their concentration gradient
    Transport Proteins
  8. These proteins are not bonded strongly to the membrane and may attach to an integral protein or just sit on the surface
    Peripheral Proteins
  9. Protiens that act like a "flag" and give other cells information about the cell. Have a polysaccharide tail sticking out of the membrane.
    Glycoproteins
  10. Three types of Passive Transport?
    • 1) diffusion
    • 2) osmosis
    • 3) facilitated diffusion
  11. what is the difference in concentration called between a region of high concentration and a region of lower concentration?
    concentration gradient
  12. when the concentrationi of the solute is the same throughout the system
    equilibrium
  13. passive transport is the movement of molecules across a membrane ___________ the concentration gradient
    with or down. from high to low concentration
  14. the movement of particles from an area of high concentration to lower concentration
    diffusion
  15. true or false: diffusion requires energy to work
    false
  16. True or false: at equilibrium the molecules stop moving and stay on that side of the membrane
    false, molecules are always moving, but the net change is equal
  17. The diffusion of water across a selectively permeable membrane
    osmosis
  18. Why does the water rise on one side of the membrane?
    the particles can't cross the membrane making the water move over in order to try and reach equilibrium
  19. both sides of a membrane have equal concentrations, equilibrium has been reached
    isotonic
  20. word used to describe a higher solute concentration
    hypertonic
  21. word used to describe a lower solute concentration
    hypotonic
  22. label what type of solution is causing the change in the red blood cells (remember their "normal" concave shape) either isotonic, hypertonic or hypotonic
    isotonic, hypotonic, hypertonic
  23. true or false: osmosis requires energy
    false
  24. true or false: osmosis is not dependent on concentration gradients
    false, all forms of passive transport move molecules (even water molecules) with the concentration gradient
  25. movement of molecules across a membrane using protein channels
    facilitated diffusion
  26. true or false: facilitated diffusion requires energy
    false
  27. true or false: active transport requires energy
    true
  28. active transport moves molecules ____________ the concentration gradient, requiring energy
    against
  29. process by which a cell engulfs molecules
    endocytosis
  30. type of endocytosis, when the cell engulfs liquid
    pinocytosis
  31. type of endocytosis, engulf particles including bacteria or other cells
    phagocytosis
  32. the process in which a cell excretes a vesicle, form of active transport
    exocytosis
  33. type of protein needed for active transport across the membrane, ATP is used to "change the shape"
    transport protein

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