The enzyme responsible for primary carboxylation in C_3-plants is
a) Hexokinase b) Succinic dehydrogenase
c) Pyruvate carboxylase d) RuBP carboxylase oxygenase
AA
BB
CC
DD
A.
(d) RuBP carboxylase/ oxygenase (RUBISCO) is an enzyme present in the stroma of chloroplast. This enzyme is responsible for primary carboxylation in C_3-plants as a 5C sugar RuBP acts as carbon dioxide acceptor in the presence of this enzyme and produces 6C unstable compound which then splits into two molecules of 3-phosphoglyceric acid (3C compound), the first stable product of C_3-cycle.