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1. The source of the energy used to power diffusion is

   
   
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2. If diffusion is the only force acting on a substance, then the substance will move from and area of _____ concentration to an area of ______ concentration.

   
   
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3. True or false: Under the correct conditions, it is possible for diffusion to move a substance from an area of low concentration to an area of high concentration.

   
   
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4. If the temperature decreases, the rate of diffusion will (increase/decrease).

   
   
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5. If the surface area for diffusion increases, the rate of diffusion will (increase/decrease).

   
   
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6. If the diffusion distance decreases, the rate of diffusion will (increase/decrease).

   
   
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7. Molecules that are able to diffuse through the lipid bilayer are generally (hydrophobic/hydrophilic).

   
   
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8. What mechanisms is used to transport small organic molecules across the membrane.

   
   
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9. True or False: Facilitated diffusion can be used to transport molecules against a concentration gradient (low to high).

   
   
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10. (Simple/carrier mediated) diffusion can be saturated.

    
    
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