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Question

Rubisco has active sites for both CO2 and O2, but binding to brings down its efficiency.

A
CO2
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B
H2
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C
O2
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D
H2O
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Solution

The correct option is C O2
RuBisco is the most abundant enzyme in nature but isn't optimized for performance like enzymes usually are. One of the chief reasons are that it has a active site that binds to both CO2 and O2. But binding to O2 leads to unnecessary reaction products that decrease the enzyme efficiency.

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