All of the Following Statements Are Correct EXCEPT

Multiple Choice

All of the following statements are correct EXCEPT

A) a heterogeneous catalyst is in a different phase from the reaction mixture.
B) enzymes are protein molecules that catalyze reactions.
C) catalysts are not consumed in reactions.
D) a reaction mechanism describes the path of a reaction at the molecular level.
E) elementary steps in a reaction mechanism are always unimolecular.