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(D) The reaction $PEP + HCO_3^{-} \rightarrow OAA$ (Oxaloacetic acid) is the primary carboxylation step in the $C_4$ pathway of photosynthesis.This re

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$PEP$ carboxylase

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(D) The reaction $PEP + HCO_3^{-} \rightarrow OAA$ (Oxaloacetic acid) is the primary carboxylation step in the $C_4$ pathway of photosynthesis.This reaction occurs in the mesophyll cells of $C_4$ plants.The enzyme that catalyzes this reaction is $PEP$ carboxylase (Phosphoenolpyruvate carboxylase).$PEP$ carboxylase has a high affinity for $CO_2$ (in the form of $HCO_3^{-}$) and does not show oxygenase activity,which helps in efficient carbon fixation even at low $CO_2$ concentrations.

Which enzyme is responsible for the reaction $PEP + HCO_3^{-} \rightarrow OAA$?

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