If the Concentrations of CO₂ and O₂ Were Equal in the Atmosphere

question 82

Multiple Choice

If the concentrations of CO₂ and O₂ were equal in the atmosphere, rubisco would favor CO₂ over O₂ as a substrate by about 2000:1 at 25°C. Why, in today's atmosphere (and at 25°C) , is the photosynthesis/photorespiration ratio of C₃ plants only about 4:1?

• A)O₂ is much more abundant than CO₂ in today's atmosphere.
• B)Rubiscos that are more selective for CO₂ are slower.
• C)O₂ is continually produced in the leaves of C₄ plants.
• D)RuBP reacts readily with O₂.

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