The compound that enters the Krebs cycle as a reactant is

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Acetyl CoA is the compound that enters the Krebs cycle as a reactant. It is produced from the breakdown of glucose during glycolysis and is further metabolized in the Krebs cycle to generate energy and carbon dioxide. ATP is not a reactant in the Krebs cycle but rather a product, PGAL is not directly involved in the Krebs cycle, and pyruvate is first converted to acetyl CoA before entering the Krebs cycle. ATP synthase is an enzyme involved in ATP synthesis, but it is not a reactant in the Krebs cycle.

The Compound That Enters the Krebs Cycle as a Reactant