Membrane Transport

This week's WarmUp focuses on how a phospholipid bilayer regulates the passage of material into and out of a cell.

  1. Please identify and describe yourself:
    First Name Last Name
    ID Number
  2. What is your group number?


  3. Explain why it is not enough to say that a solution is "hypotonic".



  4. The total solute concentration in a human cell is about 2%.  The cell membrane is impermeable to sucrose, but water and urea can migrate across the membrane.  Which of the following solutions would cause the cell to shrink the most by osmosis?

    a hypertonic sucrose solution
    a hypotonic sucrose solution
    a hypertonic urea solution
    a hypotonic urea solution
      pure water 


  5. Explain the reasoning you used to come up with your answer to question 4. Saying that you guessed or that the answer was in the book are not acceptable answers.


 
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