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Three reactions of glycolysis are so exergonic, which are not catalyzed by?

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Three reactions of glycolysis are so exergonic, which are not catalyzed by?

(a) Hexokinase

(b) PFK-1

(c) Pyruvate kinase

(d) Pyruvate dehydrogenase
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Correct option is (d) Pyruvate dehydrogenase

For explanation I would say: Three glycolytic enzymes are subjected to allosteric regulation: hexokinase IV, PFK-1 and pyruvate kinase.
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