31. Which of the following statements about transporters is incorrect? (A) Proton pump is an electro-genic pump. (B) Transport of sodium ions and potassium ions through sodium-potassium pump is an active transport. (C) The membrane potential acts as an energy source that affects the traffic of charged substances across the membrane. (D) Facilitated diffusion is a diffusion of solutes against their gradients. (E) The transport of glucose via glucose transporter is affected by the temperature.