Ch. 23 Viruses – Pages 484-493
1. Define pathogen:
2. Describe the relationship between the tobacco mosaic disease, Dmitrii Ivanowsky and Maritinus Beijerinck.
3. What is a bacteriophage?
4. What is a virus (virion)? Describe its structure.
5. Compare the size of a virus to a cell or cell parts.
6. How is the shape of a virus determined?
7. What are the shapes of viruses? Give examples.
8. List the virus features which explain why viruses are not classified in the accepted taxonomic scheme.
9. Describe the origin of viruses noting the 2 hypotheses – new and old.
10. Describe a phage.
11. What makes a virus virulent?
12. Describe and name the 5 phases of the lytic cycle. See Figure 23-2.
13. Describe a temperate virus. How do they work?
14. What is a prophage?
15. What are lysogenic cells?
16. What triggers viruses to become temperate?
17. What is lysogenic conversion? Give an example.
18. What determines what type of cell a virus can attach to? Explain this idea by using the Adenovirus and Herpes virus as examples.
19. Describe how a virus enters into an animal cell by membrane fusion.
20. Describe how a virus enters into an animal cell by endocytosis.
21. How are DNA and RNA viruses different?
22. Describe how a retrovirus works. Give an example of a retrovirus.
23. How does a virus gain its envelope?
24. How do viral proteins damage the host cell?
25. How does a virus infect a plant?
26. How can a farmer identify a plant that might have a virus?
27. Describe viroids and prions. Explain how they are different from viruses.
28. Discuss TSEs in regard to prions.
29. How are viruses grouped?
Find another resource for the following:
30. Define (in regards to viral infections):
- Acute
- Latent
- Chronic
- Slow
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