which are the primary molecules making up plasma membranes
In addition to phospholipids, the plasma membrane has cholesterol molecules and proteins that allow the membrane to function properly. Cholesterol molecules are primarily responsible for giving the membrane the rigidity it needs to hold the cellâs shape.n addition to phospholipids, the plasma membrane has cholesterol molecules and proteins that allow the membrane to function properly. Cholesterol molecules are primarily responsible for giving the membrane the rigidity it needs to hold the cellâs shape.