How Does Rubisco "Decide" Whether to Act as an Oxygenase

question 33

Multiple Choice

How does rubisco "decide" whether to act as an oxygenase or a carboxylase?

• A) Rubisco has 10 times more affinity for O₂ than 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-Benson cycle occurs.
• D) Photorespiration 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, and photorespiration proceeds.

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