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← Nature & AnimalsWhich metabolic consequence arises if a plant's rubisco enzyme preferentially binds oxygen instead of carbon dioxide?
A)Increased photosynthetic carbon fixation rate
B)Reduced ATP production in chloroplasts
C)Photorespiration-related carbon loss✓
D)Enhanced nitrogen assimilation efficiency
💡 Explanation
When rubisco binds oxygen instead of carbon dioxide, photorespiration occurs as a salvage pathway, fixing some previously reduced carbon at the cost of energy. Therefore carbon loss happens, rather than carbon fixation, increased ATP production, or improved nitrogen assimilation each requiring different metabolic pathways.
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