Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Marburg virus disease wikipedia , lookup
Human cytomegalovirus wikipedia , lookup
Avian influenza wikipedia , lookup
Canine parvovirus wikipedia , lookup
Hepatitis B wikipedia , lookup
Canine distemper wikipedia , lookup
Elsayed Elsayed Wagih wikipedia , lookup
Orthohantavirus wikipedia , lookup
Henipavirus wikipedia , lookup
Name ______________________________ Class ___________________ Date __________________ Directed Reading 10.3b Viruses Circle the letter of the best answer for each question. 1. What tiny particle gets inside a cell and often destroys the cell? a. virus c. nucleus b. bacteria d. host 2. What do many viruses cause? a. decay c. cell growth b. bacterial infections d. diseases IT’S A SMALL WORLD 3. How big are viruses? a. bigger than bacteria c. one inch wide b. smaller than bacteria d. one-quarter inch wide 4. Why can a virus’s effect on living things change? a. Viruses disappear quickly. c. Viruses change slowly. b. Viruses change quickly. d. Viruses never change. 5. Viruses are hard to fight because they are a. large and change often. c. large and change slowly. b. small and change often. d. small and change slowly. ARE VIRUSES LIVING? 6. Viruses are like living things because they a. have protein and genetic stuff. c. reproduce with binary fission. b. eat and grow. d. reproduce outside a host. 7. Which of the following statements is NOT true about viruses? a. Viruses do not eat. c. Viruses live on their own. b. Viruses do not grow. d. Viruses do not need oxygen. 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 20 Bacteria and Viruses Name ______________________________ Class ___________________ Date __________________ 8. Where do viruses reproduce? a. inside a host cell c. inside dead cells b. inside other viruses d. in the air 9. What is a living thing a virus lives on or in called? a. a bacterium c. a disease b. a virus 10. What do viruses force a host to make? d. a host a. new cells c. bacteria b. viruses d. chlorophyll CLASSIFYING VIRUSES 11. Which is NOT a way of grouping viruses? a. by shape c. by life cycle b. by size d. by the diseases they cause Select the word that best matches each description. 12. shape of tobacco mosaic virus a.spacecraft 13. shape of HIV and influenza viruses b.spheres 14. shape of viruses that attack only bacteria c.crystals 15. shape of polio virus d.cylinders 16. genetic material in cold, flu, and AIDS viruses a.protein coat b.DNA 17. protects genetic material and helps viruses enter cells c.RNA 18. genetic material in warts and chickenpox 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 21 Bacteria and Viruses Name ______________________________ Class ___________________ Date __________________ A DESTRUCTIVE HOUSE GUEST Select the word or phrase that best completes the sentence. a. lysogenic c. genetic b. viruses d. host e. lytic 19. Viruses attack cells and turn them into virus factories in the ___________________ cycle. 20. In the lytic cycle, a virus joins a cell and injects it with the virus’s ______________________material. 21. During the lytic cycle, a virus’s genes take over the host and make______________________. 22. Newly made viruses break out of the______________________, which then dies. A Time Bomb 23. New cells get a copy of the virus when the host divides in the ______________________cycle. Treating a Virus Select the word to best match each description. 24. medicines that do not kill viruses a. antiviral 25. procedure that helps prevent viral infections b. antibiotics c. vaccinations 26. type of medicine that keeps viruses from reproducing 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 21 Bacteria and Viruses