1. Carols first question was, “What is an enzyme” a. Use the enzyme lactase as an example, and explain how it functions(figure 4.1) b. What is the substrate for lactase. c. What are the end products of this reaction?
1. Carols first question was, “What is an enzyme” a. Use the enzyme lactase as an example, and explain how it functions(figure 4.1) b. What is the substrate for lactase. c. What are the end products of this reaction?
Chapter12: Useful Facts About Sugars, Starches, And Fiber
Section: Chapter Questions
Problem 17RQ
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1. Carols first question was, “What is an enzyme”
a. Use the enzyme lactase as an example, and explain how it functions(figure 4.1)
b. What is the substrate for lactase.
c. What are the end products of this reaction?
Transcribed Image Text: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.
Transcribed Image Text:Enzyme
Substrate
End Product
End product binds
to allosteric site
and changes shape
of active sito
Allosteric site
Substrate
Active
site
Enzyme
(a)(b)
End product binds
to active site
biocking substrate
(c)
Figure 4.1. Enzyme regulation.
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