The figure here shows oxygen concentration in a suspension of isolated mitochondria. Immediately after the addition of uncoupler, oxygen levels decline more rapidly than before. But soon afterwards the rate levels off. What is the likely reason for this levelling off? uncoupler Oxygen (umol) Levelling off Time (min) O A. Lack of ATP B. Decrease in the rate of glycolysis. C. Decrease in the levels of uncoupler. O D. Lack of NADH

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