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During photorespiration, the oxygen consuming reaction(s) occur in

1. stroma of chloroplasts and peroxisomes
2. grana of chloroplasts and peroxisomes
3. stroma of chloroplasts
4. stroma of chloroplasts and mitochondria

Correct answer: stroma of chloroplasts and peroxisomes

Solution

The oxygen-consuming reaction of photorespiration is the oxygenation of RuBP by RuBisCO, which occurs in the chloroplast stroma. Subsequent photorespiratory steps also involve peroxisomes, so the correct location pair is stroma of chloroplasts and peroxisomes.

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