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* 1. Resistance to amantadine and Tamiflu has been detected in the avian influenza H7N9 virus isolated recently from humans in China. How do these antivirals inhibit replication?

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* 2. Why are there so few antiviral drugs?

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* 3. Acyclovir and AZT are both nucleoside analogs. Which of the following DOES NOT pertain to both compounds:

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* 4. Why is the following sequence of a viral genome, taken from GenBank, a myth: TTTTGAATTA AAGAAAATT?

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* 5. Adding a mutagen to cells infected with a DNA virus causes a large increase in mutation frequency, but not for an RNA virus. This observation can be explained by:

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* 6. Today new viruses always evolve from existing ones, but the evolution of new viruses is constrained by:

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