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Question: you are studying an ion channel of unknown type that...

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You are studying an ion channel of unknown type that is inserted in a cells membrane. You notice that when you apply a voltage of -10 mV to the membrane using a voltage clamp amplifier, the ion channel flickers open and closed and shows a peak open current of 36 pA flowing out of the cell, and an open probability of 50% (hint: this last fact may or may not be relevant-you decide). You then apply a voltage of -100mV and the peak current reverses to become 12 pA flowing into the cell, with no change in oper probability a) b) c) What is the reversal potential of the ion channel in mV? What is the conductance of a single ion channel in Siemens? Based on what you know of reversal potentials in mammalian neurons, what is the most likely ion flowing through this channel?

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