Problem 1
The koala is a leaf-eating animal. What can you infer about its digestive system?
Problem 2
Give one possible explanation of why Penicillium would make penicillin, given that the fungus does not get bacterial infections.
Problem 4
Why is the phosphorus cycle important?
Problem 6
The following organisms have important roles as symbionts with plants and fungi; describe the symbiotic relationship of each organism with its host: cyanobacteria, mycorrhizae, Rhizobium, Frankia.
Problem 8
The following processes are used in wastewater treatment. Match the stage of treatment with the processes. Each choice can be used once, more than once, or not at all. ___________ a. Leaching field ___________ b. Removal of solids ___________ c. Biological degradation ___________ d. Activated sludge system ___________ e. Chemical precipitation of phosphorus ___________ f. Trickling filter ___________ g. Results in drinking water 1\. Primary 2\. Secondary 3\. Tertiary
Problem 9
Bioremediation refers to the use of living organisms to remove pollutants. Describe three examples of bioremediation.
