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

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Question

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

Accepted Answer

Correct Answer: A — 1 molecule of 3-C compoundSolution:RuBisCO (Ribulose-1,5-bisphosphate carboxylase/oxygenase) can act as both a carboxylase and an oxygenase. When it acts as an oxygenase (photorespiration), it adds O2 to ribulose-1,5-bisphosphate (RuBP, a 5-C compound), producing one molecule of 3-phosphoglycerate (3-PGA, a 3-C compound) and one molecule of 2-phosphoglycolate (phosphoglycolate, a 2-C compound).The question asks for the product categorised by carbon number — one 3-C compound is formed (the other product being a 2-C compound).Why other options are incorrect:B. No 6-C intermediate is formed in the oxygenase reaction (unlike carboxylation which transiently forms a 6-C compound).C. The products are a 3-C compound and a 2-C compound, not a 4-C compound.D. Two molecules of 3-C compound (2× 3-PGA) are produced during the carboxylase reaction of RuBisCO, not the oxygenase reaction.Key Concept: RuBisCO carboxylase reaction (C3 photosynthesis): RuBP (5C) + CO2 → 2 molecules of 3-PGA (3C each). RuBisCO oxygenase reaction (photorespiration): RuBP (5C) + O2 → 1 molecule of 3-PGA (3C) + 1 molecule of 2-phosphoglycolate (2C). Photorespiration occurs in C3 plants at high temperatures and high O2/low CO2 conditions and results in loss of carbon without ATP production.

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

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