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- Question
The period between inoculation of bacteria in a culture medium and beginning of multiplication is known as
Options- A. stationary phase
- B. log phase
- C. lag phase
- D. decline phase
- Correct Answer
- lag phase
- 1. An organism is completely dependent on atmospheric O2 for growth. This organism is
Options- A. osmotolerant
- B. acidophile
- C. facultative anaerobe
- D. obligate aerobe Discuss
- 2. 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 Discuss
- 3. The reproduction by budding occur in
Options- A. Rhodopseudomonas acidophila
- B. Hyphomicrobium vulgare
- C. Bacillus subtilis
- D. Both (a) and (b) Discuss
- 4. Implicit factors
Options- A. depend on developing microflora
- B. can be synergistic
- C. both (a) and (b)
- D. none of the above Discuss
- 5. 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
- 6. An organism has an optimal growth rate when the hydrogen ion concentration is very high. This organism is
Options- A. osmotolerant
- B. acidophile
- C. neutrophile
- D. aerotolerant anaerobe Discuss
- 7. Generation time of Escherichia coli is
Options- A. 20 minutes
- B. 20 hours
- C. 20 days
- D. 200 hours Discuss
- 8. The combination of low levels of NaCl, NaNO3 (sodium nitrate), and slightly acid pH can prevent multiplication and toxin formation of
Options- A. Salmonella
- B. S. aureus
- C. C. botulinum
- D. all of these Discuss
- 9. What are the extrinsic factors for the microbial growth?
Options- A. humidity
- B. storage temperature
- C. composition of gas phase
- D. all of these Discuss
- 10. The term aerotolerant anaerobe refers to an organism that
Options- A. doesn't use oxygen but can grow in the presence of oxygen
- B. is killed by oxygen
- C. requires less oxygen than is present in air
- D. prefers to grow without oxygen Discuss
Growth and Nutrition of Bacteria problems
Search Results
Correct Answer: obligate aerobe
Correct Answer: low levels of oxygen for growth (lesser than O2 present in atmosphere)
Correct Answer: Both (a) and (b)
Correct Answer: both (a) and (b)
Correct Answer: is killed by oxygen
Correct Answer: acidophile
Correct Answer: 20 minutes
Correct Answer: all of these
Correct Answer: all of these
Correct Answer: doesn't use oxygen but can grow in the presence of oxygen
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