How many enzyme-catalyzed steps are there in glycolysis?

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Multiple Choice

How many enzyme-catalyzed steps are there in glycolysis?

Glycolysis is a sequence of ten enzyme-catalyzed reactions that convert one glucose molecule into two pyruvate molecules in the cytosol. The pathway unfolds in two phases: an energy-investment phase where ATP is used to prime glucose, and an energy-payoff phase where ATP and NADH are produced. After the glucose is phosphorylated and rearranged, the molecule is split into two three-carbon pieces; a separate isomerase step then converts the other three-carbon piece so that both molecules can proceed through the same set of reactions. The rest of the steps oxidize and phosphorylate the glyceraldehyde-3-phosphate derivatives and finish with substrate-level phosphorylation to yield ATP, ending with pyruvate. Because this entire process comprises ten distinct enzyme-catalyzed reactions, the correct count is ten.

Glycolysis is a sequence of ten enzyme-catalyzed reactions that convert one glucose molecule into two pyruvate molecules in the cytosol. The pathway unfolds in two phases: an energy-investment phase where ATP is used to prime glucose, and an energy-payoff phase where ATP and NADH are produced. After the glucose is phosphorylated and rearranged, the molecule is split into two three-carbon pieces; a separate isomerase step then converts the other three-carbon piece so that both molecules can proceed through the same set of reactions. The rest of the steps oxidize and phosphorylate the glyceraldehyde-3-phosphate derivatives and finish with substrate-level phosphorylation to yield ATP, ending with pyruvate. Because this entire process comprises ten distinct enzyme-catalyzed reactions, the correct count is ten.

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