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The total solute concentration of a red blood cell is about 2%. Sucrose cannot pass through a red blood cell's plasma membrane, but water and urea can. Which of the following solutions will cause a red blood cell to shrink?

a. a hypertonic sucrose solution.
b. a hypotonic sucrose solution.
c. a hypertonic urea solution.
d. a hypotonic urea solution.

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Answer: Option C) a hypertonic urea solution

Explanation:

Since red blood cells shrink in a solution of higher concentration than itself, a hypertonic urea solution will cause water to be lost through the plasma membrane of the red blood cells leading to shrinking of the red blood cells and possibly death.