Exam 27: Environmental Microbiology

The BOD is a measurement of the amount of bacteria present before and after the sewage treatment process.

The bacteriological safety of drinking water is determined by testing water samples for the presence of human pathogens.

The dense growth of algae in an algal bloom leads to increased oxygen levels in lakes that enhance the habitat for fish.

Filtration to remove protozoa occurs in

In freshwater lakes and ponds, the majority of photosynthetic microbes are located in the zone(s).

Which of the following is NOT characteristic of fecal coliforms?

Bioremediation involves the use of microbes to degrade or detoxify pollutants.

Which of the following do NOT fix atmospheric nitrogen?

In the early 1900s, cities such as Philadelphia reduced the incidence of typhoid fever by

Based on your knowledge of extremophiles and endoliths, describe the characteristics you would expect of microorganisms capable of living on Mars or other non- Earth environments.

Which of the following is NOT a symbiotic pair of organisms?

Nitrogen fixation by bacteria occurs only in the root nodules of leguminous plants.

Figure 27.2 -Where are the benthic microbes such as Desulfovibrio and Clostridium most likely to be found in Figure 27.2?

All of the following are true of mycorrhizae EXCEPT

All of the following are used in secondary sewage treatment EXCEPT

The purpose of tertiary sewage treatment is to remove all of the phosphorus, nitrogen, and BOD left from secondary treatment.

Which of the following organisms is using sulfur as a source of energy?

Which wastewater treatment process produces BOD- containing effluent used for irrigation?

For the biogeochemical cycles of the following elements, which does NOT have an atmospheric cycle?

Sedimentation of sludge occurs in