Which of the following is true of gated ion channels?
A) Each channel can allow 10 million ions per second through the membrane.
B) The gating mechanism involves piston-like movement of the transmembrane helices.
C) Each channel lets both positive and negative ions flow through the pore.
D) Closing of the gate requires phosphorylation of the channel protein.
E) Gated channels only respond to intracellular ligands.
Answer: A