Answer: Option B) directly through the lipid bilayer.
Explanation:
Since membrane are made up of a phospholipid bilayer, with hydrophobic heads and hydrophilic tails, it permits the movement of nonpolar (organic) molecules to diffuse through it into the biological membrane. This is because they are lipophilic (lipid-loving) substances.
Examples of molecules that passed directly through the lipid bilayer are pollutants such as poly-aromatic hydrocarbons, benzopyrene etc.
Molecules with high lipid solubility can pass through lipid bilayer.
Lipid bilayer is a structure of the cell membrane that allow small uncharged molecules, lipid and hydrophobic molecules to pass through the cell membrane across their concentration gradient by a process of diffusion. Examples of molecules with high lipid solubility are oxygen, carbon dioxide, lipids, fat soluble vitamins e.t.c. The molecules are unionized form(lipophilic) and can diffuses readily across the cell.
