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110_sampleQ_03_answers - SAMPLE EXAM QUESTIONS FOR FIRST...

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SAMPLE EXAM QUESTIONS FOR FIRST MID-TERM (WITH ANSWERS) 1. A membrane that is selectively permeable to only chloride ions separates two solutions of potassium chloride, with concentrations of 1 M and 10 M. What will be the voltage of the concentrated solution relative to the more dilute solution? A. -116 mV. B. ** +58 mV C. +116 mV D. -29 mV E. -58 mV Note that the membrane is permeable only to chloride ions. The concentration difference is 10-fold, and the ion is monovalent, so from the Nernst equation we predict a voltage 0f 58mV. Chloride ions will move down their concentration gradient from the side with high concentration – negative ions leaving that side will thus make it positive with regard to the side with lower concentration. 2. At the peak of the action potential the current through sodium channels is small because;
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