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- Question
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
- Correct Answer
- quorum sensing
- 1. Which of the following is the necessary step for cultivating the microorganisms?
Options- A. Preparing a culture medium for the growth of microorganisms
- B. Sterilizing in order to eliminate all living microorganisms in vessel
- C. Inoculating the microorganisms in the prepared medium
- D. All of the above Discuss
- 2. Which of the following is not an indirect method for the measurement of cell mass?
Options- A. Nutrient composition
- B. Cell dry weight
- C. Viscosity
- D. Heat evolution Discuss
- 3. The isolation of the gonorrhoea - causing organisms, Neisseria gonorrhoeae,from a clinical specimen is facilitated by the use of media containing
Options- A. cellulose
- B. certain antibiotics
- C. succinate
- D. none of these Discuss
- 4. Stringent anaerobes can be grown in a media by taking special measure as
Options- A. boiling the media for several minutes
- B. addition of cysteine
- C. passing through oxygen-free nitrogen
- D. any of these Discuss
- 5. Semi-solid media, prepared with agar at concentrations of 0.5% or less are useful for the cultivation of
Options- A. Microaerophillic bacteria
- B. Lactobacilli
- C. E.coli
- D. all of these Discuss
- 6. 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 Discuss
- 7. 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 Discuss
- 8. Which of the following has more tolerance for acidic pH (lower pH)?
Options- A. Yeast and moulds
- B. Bacteria
- C. E. coli
- D. None of these Discuss
- 9. The term obligate anaerobe refers to an organism that
Options- 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 Discuss
- 10. Implicit factors
Options- A. depend on developing microflora
- B. can be synergistic
- C. both (a) and (b)
- D. none of the above Discuss
Growth and Nutrition of Bacteria problems
Search Results
Correct Answer: All of the above
Correct Answer: Cell dry weight
Correct Answer: certain antibiotics
Correct Answer: any of these
Correct Answer: Microaerophillic bacteria
Correct Answer: organism are aerobes
Correct Answer: organism cannot produce superoxide dismutase and/or catalase
Correct Answer: Yeast and moulds
Correct Answer: is killed by oxygen
Correct Answer: both (a) and (b)
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