AP Biology Quiz
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A membrane contains a potassium channel that is open under the experimental conditions. Intracellular K+ concentration is higher than extracellular K+. Net K+ efflux is observed and decreases when the channel is blocked, while ATP concentration remains unchanged. When intracellular K+ is experimentally lowered below extracellular K+, net K+ movement becomes inward through the unblocked channel. Which explanation best accounts for the observed direction changes in K+ movement?
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