Smaller, lipid soluble diffuse fater through cell membrane, but the movement of hyfrophilic substances is facilitated by certain transporters which are chemically

Options

A. proteins
B. carbohydrates
C. lipids
D. phospholipids.

Answer

A

Explanation

Particles which are lipid soluble (i.e., lipophilic or hydrophobic) can easily diffuse through the cell membrance as the lipid is major constituent of the membrance. Where as hydrophilic substances (i.e., the substances which are soluble in water, e.g., glucose) do not pass through a biological membrane by simple diffusion. They are, therefore, transported across a cell membrane by facilitated diffusion (i.e., carrier mediated diffusion), which takes place with the help of certain transport proteins.