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Name __________________________________ DR 10.3a: Viruses _____ 1. What is a microscopic particle that enters and often destroys a cell? a. a virus c. a protein b. a host d. a bacterium 2. Name three diseases caused by viruses. _______________________________________________________________ IT’S A SMALL WORLD _____ 3. About how many virus particles could fit in a single drop of blood? a. about 5 billion c. about 5 hundred thousand b. about 5 million d. about 5 thousand _____ 4. A virus’s effect on living things changes because a. they disappear quickly. c. they change rapidly. b. they change slowly. d. they never change. 5. Why are scientists unable to accurately count the many types of viruses? _______________________________________________________________ _______________________________________________________________ ARE VIRUSES LIVING? 6. What are two ways viruses are like living things? _______________________________________________________________ _______________________________________________________________ 7. What are four ways that viruses are not like living things? _______________________________________________________________ _______________________________________________________________ 8. Where does a virus reproduce? _______________________________________________________________ 9. The cell that a virus lives on or in is called a(n) .______________________ 10. Once a virus has entered a living cell, what does it force the cell to do? _______________________________________________________________ CLASSIFYING VIRUSES 11. What characteristics do scientists use to group viruses? _______________________________________________________________ _______________________________________________________________ Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science and Technology 8 Bacteria and Viruses Name __________________________________ Match the each description with the correct term. _____ 12. shape of HIV and influenza viruses a. crystals _____ 13. shape of many viruses that attack only bacteria b. spacecraft _____ 14. shape of tobacco mosaic virus c. spheres _____ 15. shape of polio virus d. cylinders 16. How does a virus’s protein coat help a virus? _______________________________________________________________ _______________________________________________________________ 17. Give two examples of viruses that contain the genetic material DNA. _______________________________________________________________ _______________________________________________________________ 18. Give three examples of viruses that contain the genetic material RNA. _______________________________________________________________ _______________________________________________________________ A DESTRUCTIVE HOUSE GUEST _____ 19. The cycle in which viruses attack living cells and turn them into virus factories is called the a. factory cycle. c. lytic cycle. b. reproduction cycle. d. virus cycle. Number the following events in the order of their occurrence in the lytic cycle. _____ 20. The host cell replicates the virus’s genes. _____ 21. The host cell is destroyed. _____ 22. The virus’s genes enter the host. _____ 23. The virus finds a host cell. 24. Describe the lysogenic cycle. _______________________________________________________________ _______________________________________________________________ 25. How do many antiviral medications work? _______________________________________________________________ _______________________________________________________________ 26. What are three ways people can help prevent viral infections? _______________________________________________________________ Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science and Technology 9 Bacteria and Viruses