Science Final Ch. 3 part 2

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Author:
KattthD
ID:
129379
Filename:
Science Final Ch. 3 part 2
Updated:
2012-01-21 14:51:51
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Science final
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Description:
Passive and Active Transport
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  1. what is passive transport?
    • the movement of molecules accross a cell membranne
    • or the diffuesion of molecules across a membrane
  2. Does passive transport require energy?
    NO
  3. What is diffusion
    the movement of molecules from a region of higher concentraion to a region of lower concentrations
  4. what is a concentration gradient?
    the difference in the concentration of a substance from one location to another
  5. What is osmosis?
    the process of diffusion through a semipermeable membrane
  6. What is an isotonic solution?
    the particles in the solution are moving directions at the same rate
  7. What is a hypertonic solutions?
    The solutions has a higher concentration of particles than the cell. Therefore, the conentration is higher isnide the cell than outside.
  8. In a hypertonic solution what happens to the cell?
    it shrinks
  9. What is a hypotonic solution?
    the solution has a lower concentration of particles than the cell. Therefore, the concentration is higher in the solution, outisde the cell
  10. What happens to the cell in a hypotonic solution?
    the cell expands
  11. What is facilitated diffusion?
    the diffusin of molecules across a membrane through ranport proteins
  12. is facilitated diffusion a form of passive or active transport?
    passive transport
  13. Does faciliated diffusion require energy?
    NO
  14. What is active transport?
    when molecules cross a membrane from lower to higher concentraion
  15. does active transport require energy?
    YES
  16. What is endocytosis?
    the process of taking liquids or large molecues into a cell by engulfing them in a membrane. then, enzymes break down the membrane and its contents
  17. What is exocytosis?
    the relase of substances out of a cell. the cell forms a vesicle around the material and trasports it the to cell membrane, where the vesicle fuses with the cell membrane and is relaseed

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