Question

How does the lipid bilayer form a barrier to molecules?

Answer 1

Lipid bilayer is semi permeable membrane that's y it allows only some molecules to pass through it . It act as barrier to non polar i.e., water insoluble molecules.

Answer 2

Explanation: It is perhaps more correct to say that the bilayer is a semipermeable membrane rather than a barrier. It allows some molecules to pass through, while preventing others from doing so.. Even though the bilayer is only a few nanometres thick, it is impermeable to most water-soluble (polar) molecules