Which type of molecule will diffuse through the plasma membrane most quickly?

Question

Quizplus · Accepted Answer

Small nonpolar molecules like carbon dioxide can easily diffuse through the plasma membrane because they can dissolve in the lipid bilayer, which is also nonpolar. Conversely, polar molecules like water and glucose have a harder time crossing the membrane because they cannot dissolve in the nonpolar lipid bilayer. Large molecules like testosterone would also have difficulty crossing the membrane due to their size.

Which Type of Molecule Will Diffuse Through the Plasma Membrane