The following data, presented by G. Bowes and W. L. Ogre in J. Biol. Chem. (1972) 247:2171–2176, describe the relative rates of incorporation of CO₂ by Rubisco under N₂ and under pure O₂. Decide whether O₂ is a competitive or uncompetitive inhibitor.

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[CO₂] (MM) 0.20 0.10 0.067 0.050 Under N₂ 16.7 12.5 8.3 7.1 Under O₂ 10 5.6 4.2 3.2