The reaction that is responsible for the primary fixation of `CO_(2)` is catalysed by

Options

A. RuBP carboxylase
B. PEP carboxylase
C. RuBP carboxylase and PEP carboxylase
D. PGA synthase

Answer

C

Explanation

Carboxylation is the addition of carbon dioxide to an acceptor. Photosynthetic carboxylation requires ribulose 1, 5 bisphosphates or RUBP as an acceptor of carbon dioxide and RUBP carboxylase oxygenase as an enzyme in C3 plants. In C4 plants initial fixation of `CO_2` occuring in mesophyll cells and its primary acceptor is phosphoenolpyruvate which combines within the presence of PEP carboxylase to form oxaloacetate.