The two enzymatic activities associated with RUBISCO are
A
Oxidase and oxygenase
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B
Oxygenase and carboxylase
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C
Oxidase and carboxylase
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D
Oxygenase and carbamylation
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Solution
The correct option is D Oxidase and carboxylase
The enzyme RUBISCO is involved in the carbon fixing step at the starting of the Calvin cycle. The introduction of carbon dioxide is catalyzed by the RUBISCO carboxylase. RUBISCO also acts as an oxygenase by splitting RUBP into PGA and phosphoglycolate which begins photorespiration. Thus, the correct answer is option B.