Which Factor MOST Significantly Determines the Direction in Which an Ion

question 9

Multiple Choice

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

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