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Name ______________________________ Class ___________________ Date __________________ #_____A Viruses Basics 2-3 1. Name three diseases caused by viruses. _______________________________________________________________ _______________________________________________________________ IT’S A SMALL WORLD _____ 2. About how many virus particles could fit in a single drop of blood? a. about 5 billion c. about 5 hundred b. about 5 million thousand d. about 5 thousand _____ 3. A virus’s effect on living things changes because a. viruses disappear c. viruses change rapidly. quickly. d. viruses never change. b. viruses change slowly. 4. Because viruses are so ________________ and __________________ rapidly, scientists are not sure how many different viruses there are. ARE VIRUSES LIVING? 5. A virus can only reproduce inside a ____________________. Without them, they cannot function! 6. Once a virus has entered a living cell (host), what does it force the cell to do? _______________________________________________________________ CLASSIFYING VIRUSES 7. What are four ways viruses can be grouped? _______________________________________________________________ _______________________________________________________________ 8.Protein is one of the chemical building blocks of cells. Even though a virus is not considered a living thing, it still has an outer coat made of protein. How does it help a virus? _______________________________________________________________ _______________________________________________________________ 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 ______________________________ Class ___________________ Date __________________ Viruses cont. Match the correct description with the correct term. Write the letter in the space provided. _____ 9. shape of HIV and influenza viruses a. crystals _____ 10. shape of many viruses that attack only bacteria b. spacecraft _____ 11. shape of tobacco mosaic virus c. spheres d. cylinders _____ 12. shape of polio virus 13. Give two examples of viruses that contain the genetic material DNA. a. _____________________________________________________________ b. _____________________________________________________________ 14. Give three examples of viruses that contain the genetic material RNA. a. _____________________________________________________________ b. _____________________________________________________________ c. _____________________________________________________________ A DESTRUCTIVE HOUSE GUEST 15. How is the lytic cycle different from the lysogenic cycle? _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 16. ___________________ DO NOT kill viruses! However, antiviral medications recently created will stop the virus from ______________________________. 17. What are two ways people can help prevent viral infections? a. _____________________________________________________________ b. _____________________________________________________________ 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