i) Explain the characteristics of the bacterial family that is able to symbiotically-fix atmospheric nitrogen.

ii) Identify some of the functions that microbes have in the environment.

iii) Bdellovibrio was suggested to remove E. coli from recreational waters in the 1970s. What do you think the results of these experiments were and why?

iv) What microbes generally cause spoilage of: meat, poultry, eggs, fruits and vegetables?

v) What are the functions of the following pharmaceuticals: growth hormone, human rennin, interferons, tissue plasminogen activator, and interleukin-2.