Question

which of the following will pass through a cell membrane most easily? multiple choice small polar molecules small nonpolar molecules large polar molecules large nonpolar molecules large neutral molecules

Explanation:

Cell membranes are composed of a phospholipid - bilayer. The interior of the bilayer is nonpolar. Small nonpolar molecules can easily dissolve in the nonpolar interior of the cell - membrane and pass through by simple diffusion. Polar molecules have difficulty passing through the nonpolar region, and large molecules have additional size - related hindrances.

Answer:

B. Small nonpolar molecules