Topic: C3 and C4 pathways, photorespiration· Plant Physiology

The oxygenation activity of RuBisCo enzyme in photorespiration leads to the formation of :

1. 2 molecules of 3-C compound

2. 1 molecule of 3-C compound

3. 1 molecule of 6-C compound

4. 1 molecule of 4-C compound and 1 molecule of 2-C compound

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Answer: 2. 1 molecule of 3-C compound

Key idea: In photorespiration RuBisCO acts as an oxygenase on RuBP.

RuBP (5C) plus \(\mathrm{O_2}\) gives one molecule of 3-phosphoglycerate (3C) and one molecule of phosphoglycolate (2C). So one 3-C compound is formed (alongside a 2-C compound). Option 1 describes carboxylation and option 4 is not the product of this reaction.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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The oxygenation activity of RuBisCo enzyme in photorespiration leads to the formation of :

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