Questions

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

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1 molecule of 3-C compound

1 molecule of 6-C compound

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

2 molecules of 3-C compound

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detailed solution

Correct option is A

In C3 plants some O2 does bind to RuBisCO, and hence CO2 fixation is decreased. Oxygenation activity of RuBisCO produces one molecule of 3C compound PGA, and one molecule of 2C compound phosphoglycolate. During the carboxylation step of Calvin cycle, RuBP combines with CO2 to form 2 molecules of 3PGA (3C), which is catalysed by RuBisCO.

Similar Questions

Read the following statements on photorespiration and state them as true (T) or false (F).
(A) Oxidation of RuBP in the stroma of chloroplast in bright light and high oxygen.
(B) Does not utilise ATP and reducing power.
(C) Results in the release of ${CO}_{2}$ with the utilisation of energy.
(D) The biological function of photorespiration is not yet known.