Plasma Membranes Are Relatively Impermeable to Water-Soluble Molecules Because

Multiple Choice

Plasma membranes are relatively impermeable to water-soluble molecules because

A) the membranes are waxy.
B) water molecules are nonpolar.
C) their bilayer is comprised of phospholipids.
D) they have salt crystals embedded within them.
E) large proteins extend through both sides of the membranes.