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Unformatted text preview: 1 Announcements • Please make sure cell phones are OFF • Goggles required for lab this week. An End to Ulcers? By Kristi Hannam and Rod Hagley 1: What causes ulcers? A: Stress B: Excessive stomach acids C: Bacteria D: A bad diet and alcohol use E: Being overweight WILLIAM BEAUMONT Our understanding of stomach function & ailments Hippocrates 2. If the “excess acid hypothesis” of ulcer causation is true, how could you design an experiment to test this? In your small groups, design the experiment. Remember, be specific about how you would treat your groups and what you would measure! 3. Which of these represents a good way to test the “excess acid hypothesis”? A: Examine ulcer patients of a range of ages and measure their stomach acid levels B: Have volunteers drink alcohol and measure their stomach acid levels C: Lower stomach acid levels of some volunteers (using drugs/antacids), and measure numbers of ulcers in all volunteers D: Examine patients of a range of ages and measure the number of ulcers in each person E: Put volunteers through a stress test and then measure their stomach acid levels 2 4. What step in the scientific method does this test represent? A: Making observations B: Developing an hypothesis C: Determining predictions D: Testing an hypothesis E: Assessing support for an hypothesis A Possible Study Design • Doctors divide patients into two groups: • Group 1 received antacids and were instructed to take them 3x/day, • Group 2 received sugar pills and were instructed to take them 3x/day. • After 3 months, the number of ulcers per patient is assessed • Predict what the results would look like if the excess acid theory was supported by the results of this study: Group 1 Group 2 Treatment Group # U l c e r s / p a t i e n t Draw this graph: Predict what the results would look like if the “excess acid theory” was supported by the results of this study: Which of the following graphs most closely matches the results you predicted?...
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This note was uploaded on 05/04/2011 for the course BIO 116 taught by Professor Bosch during the Spring '11 term at SUNY Geneseo.
- Spring '11