In the C4 photosynthetic pathway, the primary CO2 acceptor is:

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In C4 plants, the initial fixation of CO2 occurs in the mesophyll cells. The primary CO2 acceptor is a 3-carbon compound, phosphoenolpyruvate (PEP). The enzyme PEP carboxylase catalyzes the reaction, forming a 4-carbon compound, oxaloacetate (OAA). In C3 plants, the primary acceptor is RuBP, a 5-carbon compound, and the enzyme is RuBisCO.

In the C4 photosynthetic pathway, the primary CO2 acceptor is: MCQ with Answer and Explanation

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