A14          

Review Questions,
M. J. Malachowski, Ph.D

Diffusion and Osmosis



  1. What is a molecule? What is Brownian movement?
  2. What are the general rules governing the process of diffusion?
  3. What is meant by high concentration? Low concentration? Equilibrium?
  4. Define permeable, semipermeable, and impermeable.
  5. Describe the structure of the cell membrane.
  6. How do cell membranes control what passes through them?
  7. What is facilitated diffusion?
  8. What is the normal salt concentration of human body fluids?
  9. What is meant by isotonic, hypertonic, and hypotonic solutions?
  10. What happens to a human cell placed in each such solutions?
  11. If you know the concentrations of various substances on either side of a membrane, and if you also know the permeability of the membrane to each substance, be able to predict which substances will (or will not) diffuse, and in which directions.
  13. Distinguish between diffusion and active transport.
  14. Where does the cell get the energy required for active transport?
  15. Define osmosis.
  16. What is meant by osmotic pressure?
  17. How is osmotic pressure related to the concentration of molecules which cannot diffuse? If the osmotic pressure of a solution is high, will water diffuse into it or out of it?
  18. What is dialysis? Filtration?
















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    Updated 8/18/04 Miko Dr. Malachowski @ CCSFt