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University of Houston MICRO 3332 Quiz 10 1)During the secondary step of wastewater treatment a

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University of Houston

MICRO 3332

Quiz 10

1)During the secondary step of wastewater treatment

a.            Microbial activity breaks down organic waste

b.            The removal of large, solid debris occurs

c.             Disinfection of the effluent water occurs via chlorination and/or UV treatment

d.            Activated sludge is formed

e.            Two of the above is correct

2.            Which statement among A-C is not applicable to flocculation, or floc formation, during wastewater treatment

a.            Filamentous bacteria enhance floc formation

b.            Flocculation is important for the production of a clear effluent stream of wastewater

c.             Flocculation increases the amount of BOD entering the effluent stream of wastewater

d.            A-C are all applicable

3.            Which is not applicable to the nitrogen cycle

a.            The anammox reaction supplies NH4+ to the environment

b.            Biological activity and the Haber-Bosch process accounts for most of the atmospheric nitrogen that is converted to ammonia (or ammonium ion) on Earth

c.             Nitrogenase is the bacterial enzyme that catalyzes the conversion of N2 to NH4+

d.            Nitrite (NO2-) is a reactant in the anammox reaction

e.            Bacteria and archaebacteria are the primary organisms that drive this cycle

4.            The nitrification reactions carried out by certain bacteria would be considered anaerobic respiration

a.            True

b.            False

5.            The conversion of nitrate (NO3-) to dinitrogen (N2) gas is called

a.            Nitrogen fixation

b.            Nitrification

c.             Nitrate assimilation

d.            Ammonification

e.            Dentrification

6.            Dissimilatory nitrate reduction can lead directly to the production of

a.            Amino acids and nuclelotides

b.            NO2 and NO3

c.             N2 and NH3

d.            None of the above

7.            Four water samples were subjected to BOD analysis. Which sample had the highest BOD?

a.            A

b.            B

 

c.             C

d.            D

8.            Cellular nitrogen fixation

a.            Requires a lot of energy

b.            Leads to the oxidation of nitrogen

c.             Occurs in the absence of an enzyme

d.            Can occur in both prokaryotes and eukaryotes

9.            Nitrate incorporation into biomass is called

a.            Ammonification

b.            Assimilatory nitrate reduction

c.             Dissimilatory nitrate reduction

d.            Nitrogen fixation

10.          Eutrophication

a.            Results in increased oxygen content of a river, lake, or other body of water

b.            Initially decreases the content of photosynthetic microorganisms in a body of water

c.             Kills off bacterial types in a body of water

d.            Results in high levels of aerobic bacterial decomposition of organic matter

e.            All of the above