Nitrification converts _____.
a. organic nitrogen to NH3
b. NH3 to NH4+
c. NH4+ or NH3 to NO3
d. NO3 to N2

Coliforms are used as indicator organisms of sewage pollution because

a. they are pathogens.

b. they ferment lactose.

c. they are abundant in human intestines.

d. they grow within 48 hours.

e. all of the above

What is industrial microbiology? Why is it important?

DRAW IT Identify where the following processes occur: ammonification, decomposition, denitrification, nitrification, nitrogen fixation. Name at least one organism responsible for each process.

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Potable water is allowed to have ________coliforms per 100 ml of water tested.

Anammox reactions are

a. anaerobic and part of nitrogen cycling

b. anaerobic and part of carbon cycling

c. aerobic and part of sulfur cycling

d. aerobic and part of metal ion oxidation

Biogeochemical cycling involves three primary steps: _____, _____ , and _____.

Label the general phases in the carbon cycle. <IMAGE>

Label the processes of the nitrogen cycle. <IMAGE>