Solution: Protein pumps transport molecules through the cell membrane with the use of energy. These protein pumps transport the drug from a low-concentration area to a high-concentration area. They participate in transportation by using energy to overcome a concentration gradient, with the energy supplied by ATP. When the protein pumps are triggered by energy, they pick up solute particles from the outside and transport them to the cytoplasm. The transport rate reaches its maximum when all of the protein pumps are in use.

Active transport is the energy-dependent movement of ions across the membrane of plants via these protein pumps.