Which Statement Is False

Which statement is false?

A) PEP carboxylase and rubisco both catalyze carboxylase reactions.
B) PEP carboxylase is found only in the cytosol of mesophyll cells, whereas rubisco is found in the cytosol of both mesophyll and bundle sheath cells.
C) PEP carboxylase and rubisco both use oxygen as a substrate.
D) PEP carboxylase and rubisco are both proteins.
E) PEP carboxylase requires a three-carbon reactant, while rubisco requires a five-carbon reactant.