Micro_Test_2_spring_09 - Exam II General Microbiology...

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1 Exam II General Microbiology Spring 2009 Version 3 Provide the correct response to the problems below 1. Organisms that preferentially thrive in icy waters are described as a. Thermophiles b. Hyperthermophiles c. Psychrophiles d. Mesophiles 2. Organisms capable of causing diseases in mammals and humans are most likely 3. Each isolated bacterial colony on the surface of an agar plate usually represents growth that came from 4. Which of the following does not kill endospores? 5. Which of these treatments kills bacterial cells by damaging DNA? a. Deep freezing b. Alcohol c. Ultraviolet light d. Pasteurization 6. Sterile paper disks are soaked with one of three disinfectants: P, Q, or R. The disks are placed on medium inoculated with a bacterium and then incubated. The following chart indicates the results. Disinfectants Zone of inhibition (no microbial growth) P 13mm Q 4 mm R 10 mm
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2 7. Assuming the disinfectants diffuse into the medium at the same rate, which was the most effective against the bacterial growth? a. Disinfectant P b. Disinfectant Q c. Disinfectant R 8. Which of the following chemicals is effective in killing bacterial endospores? 9. All of the following are used to preserve foods, except
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