Most of the functions of a cell membrane are performed by proteins cholesterol None of this glycolysis Select all of the groups of membrane proteins All of the statements are correct Solution 13) It is a transmembrane protein 14) Transmembrane protein pass through both sides of the lipid bilayer and protude from both extracellular and cytoplasmic side of the membrane. It acts as a gateway to permit transport of proteins across membrane. 17) Transmembrane proteins are amphipathic as they are present in the bilayer and also protrude out of the membrane 12) Membrane proteins can be peripheral, intergral and lipid anchored..