Why Might Rubisco Have Evolved with an Inability to Distinguish

question 38

Multiple Choice

Why might Rubisco have evolved with an inability to distinguish between CO₂ and O₂?

• A)low atmospheric O₂ levels when Rubisco evolved
• B)low atmospheric CO₂ levels when Rubisco evolved
• C)high atmospheric O₂ levels when Rubisco evolved
• D)multiple subunits in the Rubisco enzyme competing for substrate
• E)selective advantages for plants that are able to bind both CO₂ and O₂

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