The unique features of enzyme is/area. They are not consumed by the enzyme- mediated reactionsb. They are not altered by the enzyme- mediated reactionsc. They lower the activation energy

Each enzyme (E) has a substrate (S) binding site in its molecule so that a highly reactive enzyme-substrate complex (ES) is produced. This complex is short-lived and dissociates into its product(s) P and the unchanged enzyme with an intermediate formation of the enzyme-product complex (EP).