How are polar molecules transported through a membrane?
A) by active transport
B) through specific channels
C) by both of these methods
D) by none of these methods

Question

Quizplus · Accepted Answer

Polar molecules cannot diffuse through the nonpolar lipid bilayer of the membrane. Therefore, they require assistance to cross the membrane. This assistance can be provided through active transport, which uses energy to move molecules against their concentration gradient, or through specific channels that allow certain polar molecules to pass through the membrane. Therefore, polar molecules can be transported through a membrane by both active transport and specific channels.

How Are Polar Molecules Transported Through a Membrane