7.1+(pg.122-124)

1. Why are viruses not exctly living or nonliving?

2. Give some examples of diseases caused by viruse.

3. Give some example of diseases caused by viruses.

4. What is the basic structure of a virus?

5. what are viruses like microsopic pirates?

6. Why are viruses considered obligate parasites?

7. Why do viruses always cause disease?

8. How do viruses "emerge" and "spread" each year? give examples.

9. What is a virus vector? Give examples.

10. what is the relationship of bird flu to brids?

11. how does flu infect humans?

12. what is a pandemic?

13. Why is there fear that bird flu could cause a pandemic?

14. Wht action can we take to prevent a bird flu pandemic?