(B) In $C_4$ plants,the primary $CO_2$ acceptor is a $3$-carbon molecule called Phosphoenolpyruvate $(PEP)$.This reaction is catalyzed by the enzyme $

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(B) In $C_4$ plants,the primary $CO_2$ acceptor is a $3$-carbon molecule called Phosphoenolpyruvate $(PEP)$.This reaction is catalyzed by the enzyme $PEP$ carboxylase $(PEPCase)$ in the mesophyll cells.In contrast,$C_3$ plants use Ribulose $1,5$-bisphosphate $(RuBP)$ as the primary $CO_2$ acceptor.