Why does Rubisco show relatively little preference for CO₂ as a substrate over O₂? A)Both CO₂ and O₂ bind directly to Rubisco's active site. B)CO₂ and O₂ bind to RuBP,which occupies the active site; their ability to attack RuBP is roughly equal. C)Rubisco binds to a regulatory site. D)CO₂ and O₂ bind to a regulatory site instead of the active site. E)Both O₂ and CO₂ are repelled RuBP.

Question

Quizplus · Accepted Answer

Rubisco's active site is occupied by RuBP, and both CO₂ and O₂ bind to RuBP. Therefore, their ability to attack RuBP is roughly equal, leading to relatively little preference for either substrate.

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Why Does Rubisco Show Relatively Little Preference for CO₂ as a Substrate