Some enzymes require specific cofactors for their activity. These cofactors form coordination bonds with side chains at the active site and at the same time form one or more coordination bonds with the substrate. Which of the following represents a correct pairing of such a cofactor with its respective enzyme?

Step-by-step solution

The description provided refers to metal ion cofactors. A number of enzymes require metal ions for their activity, which form coordination bonds with side chains at the active site and simultaneously form one or more coordination bonds with the substrate. According to NCERT, zinc is a metal ion cofactor for the proteolytic enzyme carboxypeptidase. Iron in catalase is a component of haem, which is an organic prosthetic group, not a simple metal ion cofactor. Niacin is a vitamin present in coenzymes (NAD and NADP) th