Steps of catalytic cycle of an enzyme action are :
(a) The substrate binds to the active side of the enzyme.
(b) This binding of the substrate induces the enzymes to alter its shape and fit more closely around the substrate.
(c) The active site of the enzyme, now is in close proximity of the substrate breaks the chemical bonds of the substrate and an enzyme-product complex is formed.
(d) The enzyme releases the products of the reaction
and the free enzyme is ready to take up another molecule of the substrate