1. Name three differences between normal and transformed cells.
2. What are the substrate and product of reverse transcriptase?
3. What is the difference between an oncogene and a proto-oncogene?
4. What is the major mechanism for the spread of plant viruses from one plant to another?
5. Compare the mechanisms by which phages, and animal and plant viruses adsorb to their host cells.
6. What is the major difference between a latent and chronic infection in terms of the virion?
7. Name two DNA viruses that cause tumors in humans. Name one retrovirus that causes tumors in humans.
8. Distinguish between a prion and a viroid. What hosts does each infect?
9. What family of animal viruses is most closely related to temperate phages in their interaction with host cells?
10. Define genetic reassortment. Explain how it can alter the infectivity of a virus.
Questions 1 to 7 concern the differences and similarities between animal, plant, and bacterial viruses. Answer each question based on the following possibilities by circling the correct letter:
A. Bacteriophages only
B. Animal viruses only
C. Plant viruses only
D. Bacteriophages and animal viruses
E. Animal and plant viruses
1. Bind to specific receptors on the host cell to initiate infection. A. B. C. D. E.
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