What Type of Molecule Can Rapidly Cross a Plasma Membrane

Question

What type of molecule can rapidly cross a plasma membrane?
A) Large, polar molecules
B) Small, polar molecules
C) Large, hydrophilic molecules
D) Small, hydrophilic molecules
E) Small, hydrophobic molecules

Accepted Answer

Small, hydrophobic molecules can rapidly cross a plasma membrane because their nonpolar nature allows them to easily pass through the lipid bilayer without the need for specific transport mechanisms.