Question:
The oxygenation activity of RuBisCo enzyme in photorespiration forms
The oxygenation activity of RuBisCo enzyme in photorespiration forms
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Photorespiration = oxygenation of RuBP → 1 molecule 4-C + 1 molecule 2-C. RuBisCo has dual activity (carboxylase & oxygenase), oxygenase activity increases at high O{2}/CO{2} ratios or high temperatures.
Updated On: Mar 6, 2026
- 1 molecule of 4-C compound and 1 molecule of 2-C compound
- 1 molecule of 6-C compound
- 1 molecule of 3-C compound and 1 molecule of 2-C compound
- 2 molecules of 3-C compound
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The Correct Option is A
Solution and Explanation
During photorespiration, RuBisCo catalyzes oxygenation of RuBP (5-C) in the presence of O{2}. This reaction produces one molecule of 3-phosphoglycerate (3-C) and one molecule of 2-phosphoglycolate (2-C). 2-phosphoglycolate is further metabolized in peroxisomes and mitochondria, releasing CO{2}. This reduces photosynthetic efficiency.
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