Which of the following statements regarding the diffusion of a nonpolar solute X across a cell membrane is correct?
A. At equilibrium, the net flux of X across the cell membrane is zero.
B. Solute X will reach equilibrium, but the concentration will be much higher on the inside of the cell because of the smaller volume.
C. Solute X will be unable to reach equilibrium because it is nonpolar.
D. At equilibrium, X will cease moving across the cell membrane.
E. At equilibrium, movement of X across the membrane will be much faster in one direction than in the other.
Answer: A
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