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Growth and Nutrition of Bacteria problems

1. The ability of Vibrio fischeri to produce bioluminescence chemicals only when a certain population density has been reached is an example of
Options
A. Liebig's law of the minimum
B. Shelford's law of tolerance
C. quorum sensing
D. Heisenberg's principle of uncertainty

2. A culture broth tube was very turbid at the surface but clear throughout the rest of the tube indicating that the
Options
A. organism are aerobes
B. organism should be grown in an anaerobic chamber
C. organism cannot produce superoxide dismutase and/or catalase
D. organism cannot tolerate oxygen

3. A culture broth tube was very turbid at the bottom of the tube but clear at the top of the tube indicating that the
Options
A. broth is sterile
B. organism can tolerate oxygen
C. organism cannot produce superoxide dismutase and/or catalase
D. organism should be grown in an anaerobic chamber

5. The term obligate anaerobe refers to an organism that
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A. doesn't use oxygen but tolerates it
B. is killed by oxygen
C. uses oxygen when present or grows without oxygen when oxygen is absent
D. prefers to grow without oxygen

8. Microaerophilic bacteria are those which require
Options
A. 21 % oxygen for growth
B. low levels of oxygen for growth (lesser than O₂ present in atmosphere)
C. oxygen for activation of enzymes
D. none of the above

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