The pyruvate-phosphate dikinase (PPDK) is a key enzyme of photosynthesis and catalyses a reaction similar to the one catalyzed by the pyruvate kinase (PK)-a glycolytic enzyme. Which of the following statements about these two enzymes is true?
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Although PPDK consumes only one ATP molecule, the subsequent hydrolysis of pyrophosphate ($\text{PP}_i$) means that converting pyruvate to PEP energetically costs the cell the equivalent of two high-energy phosphate bonds (ATP to AMP).