The cell membrane is described as highly selective. It bars the passage of
most but not all substances. What structural feature of the cell membrane acts
like gates that allow certain substances, including water, to pass through?
A permanent gaps in the lipid bilayer
B proteins that temporarily dissolve regions of the lipid bilayer
channels in transmembrane proteins embedded in the lipid bilayer
D channels in phosphate groups at the outer edges of the lipid bilayer