Which Factor MOST Significantly Determines the Direction in Which an Ion

Which factor MOST significantly determines the direction in which an ion moves through an ion channel in a membrane?

A) the electrochemical gradient across the membrane
B) the size and shape of the channel
C) the ion selectivity of the channel.
D) both the electrochemical gradient across the membrane and the size and shape of the channel
E) both the size and shape of the channel and the ion selectivity of the channel

Correct Answer:

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