How does the structure of an enzyme with its function? (there's a diagram and the substrate fits perfectly into the enzyme) a. the enzyme's shape fits its substrate's shape, thus allowing the enzyme to catalyze the appropriate reaction. b. the enzyme's active site can change shape in order to match any substrates in need of a catalyst. c. the enzyme is much larger than its substrate, thus allowing the catalyzed chemical reaction to take place inside the enzyme. d. the enzyme's substrate is a mirror image of the enzyme, thus allowing it to reverse any reactions initiated by the enzyme.