Which of the following enzymes do not use Fe2+ or Fe3+ ions as cofactors?
Correct Answer: Dinitrogenase
Cofactor are those additional non protein chemical component of an enzyme which are required for its optimum activity. Cytochrome oxidase, catalase, and peroxidase are the enzymes which uses Fe2+ or Fe3+ ions as cofactors. For dinitrogenase, the cofactor used is molybdenum.