The first reaction in photorespiration is

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(C) Photorespiration occurs under specific conditions:$(1)$ High $O_2$ concentration.$(2)$ Low $CO_2$ concentration.$(3)$ High light intensity.In the

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Oxygenation

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(C) Photorespiration occurs under specific conditions:$(1)$ High $O_2$ concentration.$(2)$ Low $CO_2$ concentration.$(3)$ High light intensity.In the presence of high $O_2$ and low $CO_2$,the enzyme $RuBisCO$ acts as an oxygenase rather than a carboxylase. Therefore,the first reaction in photorespiration is the oxygenation of $RuBP$ (Ribulose$-1,5-$bisphosphate),which leads to the formation of one molecule of phosphoglycerate and one molecule of phosphoglycolate.

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