Which enzyme fixes $C O_{2}$ in Calvin cycle?

RUBP carboxylase

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PEP carboxylase

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Carbonic anhydrase

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Hexokinase

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Solution

The correct option is C RUBP carboxylase
The Calvin cycle is a metabolic pathway found in the stroma of the chloroplast in which carbon enters in the form of $C O_{2}$ and leaves in the form of sugar. $C O_{2}$ in Calvin cycle is fixed by the enzyme RUBP carboxylase. Thus, option A is correct.
PEP carboxylase, carbonic anhydrase and hexokinase can not fix $C O_{2}$ in Calvin cycle, as these enzymes are not involved in Calvin cycle.
Thus, the correct answer is option A.

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