Which of the following compounds would cross a biological membrane most readily by nonmediated diffusion?

Question

Quizplus · Accepted Answer

Hexane is a nonpolar molecule and would cross a biological membrane most readily by nonmediated diffusion. Nonpolar molecules, such as hexane, can easily pass through the lipid bilayer of the membrane. Water, acetic acid, and methanol are polar molecules and would require assistance from transport proteins to cross the membrane. Acetone is a small polar molecule and may be able to cross the membrane by nonmediated diffusion but not as readily as hexane.

Which of the Following Compounds Would Cross a Biological Membrane