28. Which of the following statements best describes an enzyme? (A) Enzymes increase the rate of chemical reactions by lowering activation energy barriers. (B) Patients with lactose intolerance often suffer from insufficient amounts of a gut enzyme known as galactose. (C) Disruption of an enzyme's active site would decrease the enzyme's ability to bind the final products. (D) Only herbivores have enzymes that can hydrolyze plant starch, thus making glucose available as a nutrient for cells.