Multiple choice

The conditions under which RUBP carboxylase starts behaving as RUBP oxygenase are

  1. high temperature and high oxygen concentration

  2. low temperature and high oxygen concentration

  3. high temperature and low oxygen concentration

  4. All of the above
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A Correct answer
Explanation

RuBisCO functions as an oxygenase under high temperature and high oxygen concentration conditions, leading to photorespiration. Under normal conditions, it acts primarily as a carboxylase fixing CO2. Low temperature or low oxygen favor carboxylation, while the combination of high temperature and high O2 shifts its activity toward oxygenation.

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