Question Detail
Question
What enables selective permeability in biological membranes?
Correct Answer
Option B is the correct answer.
Detailed Explanation
Selective permeability—the ability to allow some substances to cross more easily than others—arises from the combined properties of the hydrophobic lipid bilayer (which blocks ions/polar molecules) and the specific transport proteins (channels, carriers) that facilitate passage of certain molecules.
Hint
Both the lipids and the proteins contribute to controlling what passes through.