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During photorespiration, the phosphoglycolate (PGO) produced by RuBP oxygenation is eventually converted to phosphoglycerate (PGA); 75% of the carbon in PGO is recovered. How many molecules of PGO are required to generate two molecules of PGA through this route

Respuesta :

Answer:

4

Explanation:

1. Photorespiration occurs in plants and it is a wasteful pathway, it competes with the Calvin cycle. It begins when rubisco (Ribulose-1,5-bisphosphate carboxylase/oxygenase (RUBISCO) catalyzes both CO2 and O2 fixation) acts on Oâ‚‚ instead of COâ‚‚.

2. Photorespiration is initiated by the oxygenase activity of rubisco, the same enzyme that is also responsible for CO2 fixation.

3. Phosphoglycolate formed by Oâ‚‚ fixation is recycled to the Calvin cycle intermediate phosphoglycerate in the photorespiratory pathway.

4. During oxygen fixation,1 molecule of PGA and 1 molecule of 2-phosphoglycolate are formed. The 2-phosphoglycolate  is converted back to PGA in the photorespiratory cycle.

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