Which of the following traits do ammonia and nitrite oxidizers share?
A) chemoorganotrophic
B) autotrophic
C) aerobic
D) autotrophic and aerobic
Answer: D
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In order to speed up the sterilization process, which of the following would be useful?
A. Drying the material B. Washing/mechanical removal of bacteria/organic matter C. Addition of organics D. Nothing E. Washing/mechanical removal of bacteria/organic matter AND addition of organics
The autoclave uses pressurized steam at high temperature for sterilization
a. true b. false
Endospores of certain bacterial species can enter tissues in the human body, germinate, and cause an infectious disease.
Answer the following statement true (T) or false (F)
Looking at your results of the Ames test using bacteriological agar medium plates lacking the amino acid histidine, you find that there are many colonies growing on the agar. How do you interpret this result?
A. The drug being tested has no inhibitory effect on the bacterium; therefore, it is not a good antibiotic to give for treatment of disease. B. The chemical being tested is mutagenic. C. The bacterium has turned its operon genes on, producing proteins necessary for growth. D. The bacterium does not have any plasmids, so it cannot grow on the medium.