Passive Transport and Cell Membrane Worksheet by k5V4cU

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									Passive Transport and Cell Membrane Worksheet                        Name ______________________
                                                                     Date ____________ Period _____

Pages 95-97
1. When molecules diffuse in/out of a cell is the cell doing work? Explain.



2. Describe the state of equilibrium.



3. True or False? At equilibrium the random movement of molecules stops.

   Explain using the term “net movement”.




4. What are the solutes in cells?

   What is the solvent in cells?

5. Identify the net movement of water in each of the following conditions. Give a brief explanation
   for each answer.
   a) When the external solution has a lower concentration of solutes compared to the cytoplasm
      (cytosol).



  b) When the external solution has a higher concentration of solutes compared to the cytoplasm.



  c) When the concentration of solutes outside the cell is equal to the concentration inside the cell.




  Page 58
  6. Phospholipids are the major components of the cell membrane. Describe the structure of a
  phospholipid using the following terms: fatty acids, glycerol, hydrophilic, hydrophobic.
  7. Explain why the cell membrane is a bilayer of phospholipids instead of a single layer. Use your
  understanding of the meaning of the terms hydrophilic and hydrophobic.




  Pages 73-74
  8. The cell membrane is described as “selectively permeable”. What does this mean?



  9. Besides lipids, what other macromolecules is a major component of cell membranes?

  10. What is the difference between an integral protein and a peripheral protein?



  Page 96
  11. What determines how easily a molecule will diffuse across the cell membrane?



Pages 946-947
12. Use your knowledge of diffusion and concentration gradients to explain the following.
a) Movement of oxygen from the lungs into the bloodstream.



b) Movement of oxygen from the bloodstream into cells.




c) Movement of carbon dioxide from the cells into the bloodstream.




d) Movement of carbon dioxide from the bloodstream into the lungs.

								
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