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1. Which microorganisms are most responsible for stabilization of organic material?

   1.   ?    Rotifers
   2.   ?    Stalk Ciliates
   3.   ?    Bacteria
   4.   ?    Worms

2. Electron microscopes are commonly used to observe living microorganisms.

   1.   ?    True
   2.   ?    False

3. Which indicator organisms will be more dominant when the SRT is low and the sludge is young?

   1.   ?    Rotifers
   2.   ?    Stalk Ciliates
   3.   ?    Water Bears
   4.   ?    Free Swimming Ciliates

4. Which type of bacteria can use oxygen either in a free, dissolved form or a combined form?

   1.   ?    Aerobic
   2.   ?    Anaerobic
   3.   ?    Facultative
   4.   ?    Fermenters

5. Which conditions will typically allow filamentous bacteria to grow and become dominant in activated sludge?

   1.   ?    Low D.O. and high F/M
   2.   ?    High D.O. and low F/M
   3.   ?    High D.O. and high F/M
   4.   ?    Low D.O. and low F/M

6. Which microorganisms can typically ingest many types of small organic particles, but bacteria are their main food source?

   1.   ?    Amoebas
   2.   ?    Rotifers
   3.   ?    Stalked Ciliates
   4.   ?    Free Swimming Ciliates

7. Which is an aerobic process where certain groups of microorganisms convert Ammonia-N into Nitrite-N and then to Nitrate-N?

   1.   ?    Fermentation
   2.   ?    Anoxic
   3.   ?    Anaerobic
   4.   ?    Nitrification

8. Which bacterial group typically produces a higher sludge yield as a result of assimilation?

   1.   ?    Heterotrophic
   2.   ?    Autotrophic
   3.   ?    Nitrifiers
   4.   ?    Anaerobic

9. Which growth phase typically produces the highest degree of cannibalism among the microorganisms?

   1.   ?    Log Growth
   2.   ?    High Rate
   3.   ?    Endogenous Respiration
   4.   ?    Declining Growth

10. What will microorganisms typically do when subjected to an excessive supply of food (CBOD₅)?

    1.   ?    Grow and multiply
    2.   ?    Slow their growth process
    3.   ?    Die
    4.   ?    Nitrify