Cell Transport

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Cell Transport
2012-02-01 17:43:20

4th science test
Show Answers:

  1. What must the plasma membrane do, but also not do?
    must associate with water, but not dissolve
  2. What are the layers of the plasma membrane made of?
    phospholipids (phosphate heads outward)
  3. What are the three components of the plasma membrane?
    • phospholipids
    • proteins
    • cholesterol
  4. The plasma membrane is made out of __________ becasue they are _________, which means that they are both ________ and __________
    • Phospholipids
    • amphipatic
    • polar
    • non-polar
  5. What do proteins form in the plasma membrane?
    ports or channels for large moleculues, such as amino acids or sugars
  6. What the the three types of carriers proteins?
    • uniport
    • antiport
    • symport
  7. What is an uniport carrier protein?
    only carries one type of solute across the cell membrane; selectively bringing that solute from one side of the membrane to the other
  8. What is an antiport carrier protein?
    carries two types of solutes that are going in opposite directions
  9. What is a symport carrier protein?
    carries two types solutes that are traveling in the same direction
  10. What does cholesterol do for the plamsa membrane?
    it gives structure but it still gives it the ablity to move and flow
  11. Define: Passive Transport
    does not require energy
  12. Define: Diffusion
    movement of stuff
  13. Somethings can _________ through the _______ ________.
    • diffuse
    • plamsa membrane
  14. Define: Concentation Gradient
    a change in something (high to low/ low to high)
  15. What does Brownian Motion say?
    molecules are always in continual movement
  16. What does everything in nature do?
    to go from high to low
  17. What does everything in nature want to achive?
    Dynamic Equilibrium or balance
  18. Define: Osmosis
    the moving of water
  19. What are the three types of Osmosis?
    Hypertonic, Hypotonic, and Isotonic
  20. What is hypertonic osmosis?
    high concentration of water inside the cell
  21. What happens to red blood cells and plant cells when hypertonic osmosis happens?
    • Red blood cells will shrivel up
    • Plant cell will have everything bunched togeter
  22. What is Hypotonic osmosis?
    high cencentration of water outside the cell
  23. Why would you receive a hypotonic IV?
    you could get a hypotonic solution IV if you are severly dehydrated
  24. Why do grocery stores spray veggie's with water?
    to make the veggie's remain crisp and make sure that they won't wilt
  25. What is Isotonic Osmosis?
    concentations are the same inside and outside the cell
  26. What type of Osmosis solutions is most likely to be given to you in an IV?
  27. Define: facilitated diffusion
    the molecules that are diffusing are too large to go through membrane so they need to use the ports (example: amino acids)
  28. Define: active transport
    required energy
  29. Define: cytosis
    the way a singal celled orgianism can eat its food
  30. Define: emdocytosis
    And give the two different kinds
    • food taken in
    • Phago (soild) and Phino (liquid)
  31. Define: Exocytosis
    food out
  32. Living cells maintain a ________ by controlling materials that enter and leave.
  33. Without this ability, the cell cannot maintain ___________ and will die.
  34. The cell must regulate internal concentrations of water, ________, and other nutrients and must eliminate waste products.
  35. Homeostasis in a cell is maintained by the _____________ , which allows only certain particles to pass throug and keeps other particles out.
    plasma membrane
  36. What property of a membrane that allows only some particals to pass through the membrane?
    selective permeability
  37. True or false
    the structure and properties of the cell wall allow it to be selective and maintain homeostasis.
  38. True or false
    The plasma membrane is a bilayer of lipid molecules with protein molecules embedded in it
  39. True or false
    A phospholipid molecule has a nonpolar water-insoluble head attached to a long polar, soluble tail.
  40. True or false
    The fluid mosaic model describes the plasma membrane as a structure that is liquid and very rigid.
  41. True or false
    Cell organelles, such as the nucleus, vacoles, mitochondria, and chloroplasts, are enclosed by membranes.
  42. True or false
    The greater the number of saturated fatty acids a membrane contains, the more fluid it is.
  43. True or false
    In animals, cholesterol strengthens the fluid mosaic and makes the plasma membrane more stable
  44. Iso, Hypo, or Hyper?
    the concentations of dissolved substances outside the cell is ower than inside the cell
  45. Iso, Hypo, or Hyper?
    when a cell is placed in this solution, water will enter the cell by osmosis, resulting in turgor pressure
  46. Iso, Hypo, or Hyper?
    the concentration of dissolved substances outside the cell is the same as the concentration inside the cell
  47. Iso, Hypo, or Hyper?
    the concentration of dissolved substances outside the cell is higher than the concentration inside the cell
  48. Iso, Hypo, or Hyper?
    when injected into the body, it will not cause cellular damage because no osmosis occurs
  49. Iso, Hypo, or Hyper?
    putting a plant cell in this type of solution will result in a loss of water, and a drop in turgor pressure (or plasmolysis), which will cause the plant to wilt