Ion channels are basically channel proteins involved in the transport of ions through the membrane. These usually respond in the presence of certain stimuli. Being transport channels across the membrane, the channel should span the membrane's thickness with opening on both outer and inner membrane.
Which of the following statements about ion channels is FALSE?
A. Ion channels are multi-subunit proteins.
B. Ion channels allow ions to move against their concentration gradient.
C. The selectivity of an ion channel is dependent upon the amino acids that comprise the mouth of the channel.
D. Ion channels are integral membrane proteins.
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