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← Nature & AnimalsWhich consequence results when photorespiration depletes RuBP in chloroplasts?
A)Reduced photosynthetic carbon fixation efficiency✓
B)Increased electron transport chain activity
C)Enhanced chlorophyll biosynthesis rates
D)Decreased thylakoid membrane permeability
💡 Explanation
When photorespiration occurs, rubisco binds oxygen instead of carbon dioxide, using RuBP via the oxygenase reaction of the Calvin cycle reaction; therefore this reduces RuBP availability for carbon fixation, because RuBP is consumed without producing G3P, rather than facilitating electron transport or chlorophyll synthesis.
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