Question

Which is not a constituent of cell membrane?

Answer 1

Cell membrane

Cell membrane is made up of a lipid bilayer and proteins embedded inside the bilayer.

There are different types of proteins with specific functions and other lipid components.

Phospholipids, glycolipids and cholesterol are all members of lipid bilayer that are present on the cell membrane.

Proline

Proline is an amino acid and is not one of the constituents of the lipid bilayer of the cell membrane.

Final answer

(D) Proline