What Determines Whether Rubisco Acts as an Oxygenase or a Carboxylase

question 86

Multiple Choice

What determines whether rubisco acts as an oxygenase or a carboxylase?

• A) Rubisco has ten times more affinity for O₂ than for CO₂; therefore, it favors O₂ fixation.
• B) If O₂ is relatively abundant, rubisco acts as a carboxylase.
• C) If O₂ predominates, rubisco fixes it, and the Calvin cycle occurs.
• D) Oxygenase activity is more likely at low temperatures.
• E) As the ratio of CO₂ to O₂ falls in the leaf, the reaction of rubisco with O₂ is favored.

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