1. Which of the following descriptions about ion channels is incorrect?
(A) Sodium channel can let sodium ion pass.
(B) Ion channel uses ATP to pump jons from one side to the other sidc of the channel.
(C) Membrane potential can be a mechanism to control the open or close state of an ion channcl.
(D) Ligand-gated ion channel needs a receptor binding site to control its open or close state.
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