1. What are biofilms, how do they form, and how can biofilms complicate treatment of infectious diseases?

2. Why are septic tanks and oxidation ponds not feasible for large municipalities?

3. What is the purpose of a coliform count on water?

4. Bioremediation refers to the use of the living organisms to remove pollutants. Describe three examples of bioremediation.

 5. Is it possible for plant breeders to develop a true-breeding pink-flowered snapdragon?