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Chapter 3, Problem 12RQ

A physiologist observes that the concentration of sodium inside a cell is decidedly lower than that outside the cell. She also observes that there is a small leakage of sodium into the cell. What cellular process prevents the sodium concentration gradient from disappearing? (a) osmosis, (b) diffusion, (c) primary active transport, (d) secondary active transport.

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All of the following are passive membrane transport processes except: (a) diffusion. (b) facilitated diffusion. (c) vesicular transport. (d) osmosis.
Which of the following statements about the sodium-potassium pump is correct?   A) Both sodium and potassium move down their concentration gradient across the membrane B) 2 sodium ions are pumped out of the cell against their concentration gradient C) The sodium-potassium pump is a type of cotransport. D) ATP is used as an energy source
A blood cell with a 2% internal solute concentration is placed in a solution that has a 0.2% solute concentration. The solute is impermeable to the plasma membrane. How would you classify the solution compared to the cell – hypotonic, hypertonic or isotonic? Why? (2 pts.) B)  Will the solutes move across the membrane? Why or why not?  C)  What type of transport would occur in this situation – diffusion, facilitated diffusion, osmosis, active transport or bulk transport. Explain. D)  What would happen if the cell began to produce a new membrane protein that allowed the solutes to freely move in across the membrane? ould this change your answer to Part C? Explain.
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