Question

example molecules
how do the molecules pass through the cell membrane?

Explanation:

Small non - polar molecules can pass through the cell membrane by simple diffusion as they can dissolve in the lipid bilayer. Polar and large molecules often require transport proteins (channels or carriers) for facilitated diffusion or active transport to cross the membrane, depending on the concentration gradient and energy requirements.

Answer:

Small non - polar molecules pass by simple diffusion. Polar and large molecules may use facilitated diffusion or active transport with the help of transport proteins.