Biology test

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Biology test
2013-09-22 19:52:50


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  1. water and salt will go in _ directions
  2. diffusion of water
  3. everything goes from a _ concentration to a _ concentration (diffusion)
    high, low
  4. the difference in concentration between 2 solutions
    concentration gradient
  5. the tails are _
    hydrophobic (don't react well with water)
  6. the heads are _
    hydrophilic (react well with water)
  7. the tails are lipid so they are _
  8. the head of a phospholipid bilayer is _
  9. what solution is it where the cell is less concentrated and the cell can swell and pop
    hypotonic solution
  10. what solution is it where the cell is more concentrated and the cell will shrink and die
    hypertonic solution
  11. what solution is it when the cell is equal
    isotonic solution
  12. what receptor changes cell activity?
    membrane receptor
  13. what receptor is it when the ligand goes into cell and binds with receptor?
    intracellular receptor
  14. what are the 2 types of receptors?
    • 1)intracellular receptor
    • 2)membrane receptors
  15. what r the steps in exocytosis?
    • 1)vesicle takes substance to cell membrane
    • 2)vesicle attaches to cell membrane
    • 3)vesicle opens and releases substance
  16. What are the steps in endocytosis?
    • 1)membrane forms a pouch around the substance
    • 2)vesicle forms around substance
    • 3)vesicle breaks down and releases substance
  17. in _, vesicles move substances out of the cell
  18. _ uses vesicles to move large substances into the cell
  19. what make up vesicular transport?
    endocytosis and exocytosis
  20. proteins pump the molecule across the cell membrane _ its concentration gradient
  21. what type of active transports are there?
    • 1)protein pumps
    • 2)vesicular transport
  22. what kind of transport is it where the molecules are moving up the concentration gradient
    active transport
  23. what kind of transport requires energy?
    active transport
  24. what diffusion is it where the protein channel changes to help move the molecules along
    facilitated diffusion
  25. movement of water down a water's concentration gradient
  26. what type of passive transport moves molecules straight thro the membrane or through protein channels?
  27. moves molecules from a lower concentration to a higher concentration
    active transport
  28. move molecules from a higher concentration to a lower concentration
    passive transport
  29. what size of a molecule can pass thro a membrane easier
    a smaller molecule
  30. what of a molecule means their ability to pass through a membrane
    their polarity
  31. What 3 things determines how the molecules cross the membrane?
    • 1)molecules polarity
    • 2)molecules size
    • 3)molecules concentration
  32. the cell membrane is described as _ _
    selectively permeable
  33. molecules have to cross the _ _
    cell membrane
  34. the cell has to move molecules in and out of the cell to maintain _
  35. what 3 characteristics do all living things have?
    • 1)reproduce and develop
    • 2)need energy
    • 3)respond to their environment
  36. the cell is _