Which metabolic shift occurs when photorespiration dominates within a plant mesophyll cell?

💡 Explanation

When photorespiration dominates, rubisco binds to O2 instead of CO2, leading to the inefficient breakdown of RuBP, decreasing ATP and fixing less carbon, since CO2 production occurs with energy expenditure. Therefore, reduced ATP and carbon fixation results, rather than increased NADPH, RuBP efficiency, or glucose synthesis each requiring net carbon gain.

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