2. Carol now has some idea what you meant by protein but wants to know what you meant by "catalyst." Explain. 3. Carol partly understood that, but what exactly did you mean by "activation energy"? 4. You told Carol that there are thousands of different enzymes in her body. a. Why can't one of the other ones break down lactose? b. Why are they all so specific? 5. Why would Carol's doctor suggest that she eat yogurt instead of other milk products? 4. Lactose Intolerance (Enzymes) Carol was recovering from a terrible bout with the flu, having been sick for nearly two weeks. As she was getting her strength back, her appetite also improved. In fact, after not eating very much for almost two weeks, Carol was famished. But something strange happened to her: When she began eating milk products after the illness, she experienced terrible abdominal distress-she had bloating, pain, and diarrhea. Carol went to see her doctor and explained her symptoms. Her doctor said that the virus she contracted must have affected the enzyme-producing cells in her small intes- tine. Carol had become lactose intolerant. Whenever she ate any food containing milk, her digestive system was unable to break down the sugar in the food or beverage. Her doctor suggested that Carol stay away from dairy products, except for yogurt. Last night Carol saw you studying your biology textbook in the library, and she asked you to explain some things to her.