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Multiple Choice Question 1. Which biophysical property of the plasma membrane means that potassium plays a major role in determining the resting membrane potential: (a) K+ (but not Na+) is soluble in the plasma membrane (b) The activation of voltage-operated Na+ channels (c) The membrane is more permeable to K+ compared with Na+ (d) The sodium pump (3Na+/2K+ ATPase) is electrogenic