2 analyzing compare and contrast the function of

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2. Analyzing. Compare and contrast the function of phagocytes in the inflammatory response with the function of specific lymphocytes in the immune response. 3. Synthesizing. Suppose that several people in a community have a disease that is spreading rapidly. If you were a public health worker assigned the task of finding out how the disease is being transmitted, what might you do to find the cause? Test Practice Test Practice Read the paragraph below, and then answer the questions. Bacteria, including pathogens, reproduce by binary fission, or simple division. Under ideal conditions, the average time for bacterial division to occur is about 15 minutes. However, the times vary from about 10 minutes to about 24 hours. From a single bacterium, how can you find out how many bacteria exist after a certain length of time? It’s not simple multiplication because more and more bacteria are undergoing fission all the time. From the initial bacterium, two are formed. From these two, four form. How can you describe this pattern? After one reproductive cycle, you have two bacteria, or 2 1 . After two cycles, you have four, or 2 2 . You can summarize this pattern by the formula B = 2 n , where B is the number of bacteria, and n is the number of reproductive cycles. 1. How many bacteria exist after six reproductive cycles? 12 32 64 It depends on the length of the reproductive cycle. 2. One bacterium has a reproductive cycle of 20 minutes. How many bacteria will there be at the end of three hours? 9 60 512 600 3. What would be the shape of the graph where time is plotted on the x -axis and the number of bacteria is plotted on the y -axis? Where is the slope of the line the steepest?
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646 Sexually Transmitted Infections and HIV/AIDS The Risks of STIs Common STIs HIV and AIDS Treatment for HIV and AIDS HS_HEALTH_U08_C25_CO 12/8/03 5:30 PM Page 646
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Using Visuals. HIV/AIDS awareness and understanding the dangers of STDs can help prevent the spread of these infections. What can you do to participate in fund-raisers and awareness campaigns for HIV/AIDS research? 647 Make this Foldable to help you organize what you learn about the risks of sexually transmitted infections. Begin with a sheet of 8 1 / 2 x 11 paper. Fold a sheet of paper along the long axis so the bottom edge lies 2 from the top edge. Fold into thirds. Unfold and cut along the inside fold lines. Label as shown. As you read and discuss the material in the chapter, use your Foldable to define terms and record what you learn. Before You Read THE RISKS OF STDs Behaviors Consequences Prevention As You Read HS_HEALTH_U08_C25_CO 12/8/03 5:30 PM Page 647
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VOCABULARY sexually transmitted diseases (STDs) sexually transmitted infections (STIs) epidemics abstinence The Risks of STIs YOU’LL LEARN TO Explain the relationship between alcohol and other drugs used by adolescents and the role these substances play in unsafe situations such as HIV/STDs.
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