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- Question
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
- Correct Answer
- all of these
- 1. Generation time of Escherichia coli is
Options- A. 20 minutes
- B. 20 hours
- C. 20 days
- D. 200 hours Discuss
- 2. 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
- 3. 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 Discuss
- 4. 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
- 5. 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
- 6. 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
- 7. 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
- 8. Which of the following procedures uses a photocell to measure absorbance of a culture to regulate the flow of culture media?
Options- A. Coulter Counter
- B. Hemostat
- C. Petroff-Hausser chamber
- D. Trubidostat Discuss
- 9. The average size of cells during the exponential phase of growth is
Options- A. greater than the lag phase
- B. lesser than the lag phase
- C. equal to the lag phase
- D. none of these Discuss
- 10. A microbe, which grows at temperatures above 95° C is most likely to be
Options- A. an archaean
- B. a fungus
- C. a protozoan
- D. none of these Discuss
Growth and Nutrition of Bacteria problems
Search Results
Correct Answer: 20 minutes
Correct Answer: acidophile
Correct Answer: lag phase
Correct Answer: obligate aerobe
Correct Answer: low levels of oxygen for growth (lesser than O2 present in atmosphere)
Correct Answer: all of these
Correct Answer: doesn't use oxygen but can grow in the presence of oxygen
Correct Answer: Trubidostat
Correct Answer: lesser than the lag phase
Correct Answer: an archaean
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