Water Potential, Diffusion And Active Transport

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Transportation Quizzes & Trivia
A quiz on water potential, diffusion, active transport and other cellular transport. HUMAN BIOLOGY AS LEVEL

  
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  • 1. 
    Diffusion is the ____ _________ of a substance from a region where it is in ______ concentration to a region where it is in ______ concentration.

  • 2. 
    Diffusion is said to be a _______ process.

  • 3. 
    What can not diffuse through the phospholipid bilayer?
    • A. 

      Small, lipid-soluble molecules

    • B. 

      Molecules that are soluble in water

    • C. 

      Charged particles such as ions


  • 4. 
    Facilitated diffusion is the diffusion of molecules through the plasma membrane with the help of ________. Some of these are protein _______ that are permanently open. They are lined with _____philic amino acids and water. Molecules can also diffuse through the membrane by binding to ______ proteins.

  • 5. 
    What kind of process is facilitated diffusion?
    • A. 

      Active

    • B. 

      Passive


  • 6. 
    Osmosis is the movement of ______ molecules from a region of _____ water potential to a region of _____ water potential.

  • 7. 
    Pure water has the highest  possible water potential of ___ .

  • 8. 
    Adding solutes to water ______ the water potential, for example it makes the water potential more ______.
    • A. 

      Increases, positive

    • B. 

      Increases, negative

    • C. 

      Decreases, negative

    • D. 

      Decreases, positive


  • 9. 
    Osmosis occurs until the water potential is the same on both sides of the membrane. At this point, ___________ has been reached.

  • 10. 
    A solution with the same water potential as a cell is said to be _______ with the cell.

  • 11. 
    A solution with a lower water potential than the cell is said to be __________.

  • 12. 
    A solution with a higher water potential than the cell is said to be _________.

  • 13. 
    Glucose and other solutes will dissolve in blood plasma and ______ the water potential but it is mainly the concentration of electrolytes in plasma and in cells that is responsible for maintaining a water potential ________. Electrolytes are ions with a positive or negative _______. Positively charged ions are called _______ and those with a negative charge are called _______.

  • 14. 
    Diffusion, osmosis and facilitated diffusion go ______ the concentration gradient.
    • A. 

      Against

    • B. 

      Down


  • 15. 
    Active transport is the movement of a substance across a cell membrane ______ its concentration gradient, using energy from ___.

  • 16. 
    Exocytosis is...?
    • A. 

      Is when after the the bacterium has been digested, the waste products are released back out of the cell

    • B. 

      Is when the bacterium is engulfed into the cell


  • 17. 
    Endocytosis is...?
    • A. 

      Is when after the the bacterium has been digested, the waste products are released back out of the cell

    • B. 

      Is when the bacterium is engulfed into the cell


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