2260e CS3 Lactose Intolerance (2).docx

You need to digest lactose into the two components

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You need to digest lactose into the two components because the cells in your intestine can only take up galactose and glucose but not lactose. If lactose stays in the intestine
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NATIONAL CENTER FOR CASE STUDY TEACHING IN SCIENCE “I Scream for Ice Cream” by Sellami, Vemu, & Morris, modified by C Lamey 2019 Page 4 and is not digested into its com- ponents, it will be consumed by gut bacteria which produce various gases in the large intestine—that’s what leads to the symptoms Xiao-Ma and I experience when we consume dairy. Here’s a picture from my biochem book showing how the lactase enzyme breaks down the milk sugar lactose into its components glucose and galactose: Figure 2. Action of lactase. It also says in here that you can test if you are intolerant to dairy (so lactose intolerant) by measuring the level of glucose in your blood after drinking milk. Questions 4. What is the difference between a protein and an enzyme? Refer to chapter 2 – Biological Macromolecules or search the internet if you need more clarification and distinguish between the two terms below: 5. What is a monosaccharide and what is a disaccharide? Which of these three sugars in figure 2 are mono- or disaccharide? (recall this information was covered in Chapter 2 – Biological Macromolecules) 6. Differentiate between lactose and lactase. 7. What is Lactaid and how can taking it help someone who is lactose intolerant digest dairy? 8. Why would a test for tolerance to lactose measure the levels of blood glucose and not lactose? Hint: This one is kind of “tricky”; think of where in the body the lactose is – it can’t be absorbed into the bloodstream, and think about where glucose is… 9. Would you expect higher or lower glucose levels for dairy tolerant individuals after consuming milk? Why? Draw your predictions for a lactose tolerant and lactose intolerant person into the graph below and explain why. B. – Blood Glucose Test
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NATIONAL CENTER FOR CASE STUDY TEACHING IN SCIENCE “I Scream for Ice Cream” by Sellami, Vemu, & Morris, modified by C Lamey 2019 Page 5 Esiankiki: Oh, now I remember—I’ve heard of this test before. My mom’s a physician with her own office here in town. I know that my mom is participating in a clinical trial for a new lactose intolerance test that measures blood glucose.
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