Why is phosphofructokinase (PFK) rather than hexokinase (HK) the pacemakerof glycolysis? Which is the best answer among the following three choices?PFK is regulated by energy charge, meaning that unlike HK, PFK changes speedaccording to the needs of the organism.Pacemaker PFK is essential for cardiac function, much like an electronic pacemakerused by some heart patients.HK, as the first step of glycolysis, is not only used for glycolysis. The first committedstep of glycolysis is catalyzed by PFK
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