In active transport, the affinity of the carrier protein for the molecule being transported is greater on which side of the membrane? In active transport, the affinity of the carrier protein for the molecule being transported is greater on which side of the membrane? always the side facing the intracellular fluid always the side facing the extracellular fluid on the side where the molecule is in lower concentration on the side where the molecule is in greater concentration Neither; it is equal on both sides of the membrane.