Which best explains why a K+ channel does not let Na+ ions pass through? A) The voltage-gate for the ion channel is closed when the membrane potential is negative. B) The orientation of the membrane potential works against the flow of Na+ ions. C) The structure of the K+ channel mimics the preferred oxygen coordination of K+ ions, but not Na+ ions. D) The selectivity filter of the K+ channel is lined with Gly and Tyr amino acids. E) The selectivity filter of the K+ channel is lined with Arg and Lys amino acids. Write the letter corresponding to the one best choice.
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