Keto-enol tautomerization is an important mechanism inglycolysis.

How many molecules of ATP are used in the reaction, and how manyare directly made?

Two are used to phosphorylate the glucose, and two are directlymade, one from 1,3-bisphosphoglycerate and one fromphosphoenolpyruvate.

Two are used to phosphorylate the glucose, two are used tophosphorylate glycerol-3-phosphate in step Gly-6, and four aredirectly made from 1,3-bisphosphoglycerate andphosphoenolpyruvate.

Two are used to phosphorylate the glucose, and four aredirectly made from 1,3-bisphosphoglycerate andphosphoenolpyruvate.

Two are used to phosphorylate the glucose, four are directlymade from 1,3-bisphosphoglycerate and phosphoenolpyruvate, and sixare made from the two NADH molecules generated in glycolysis.

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