Question

Name the enzyme that catalyses carboxylation as well as oxygenation reaction. In which cell organelle is this enzyme found and in what way is that organelle different in the mesophyll and bundle sheath cells ?

Answer 1

RubisCO enzyme catalyses carboxylation and oxygenation reactions. It is found in the chloroplast (cell organelle). 

Chloroplasts in mesophyll cells are granal but chloroplast of bundle sheath cells are agranal. Granal chloroplasts have thylakoids stacked to form grana (as in C₃ plants). Agranal chloroplasts are without grana but thylakoids are found as stroma lamellae.