Growth and Nutrition of Bacteria problems
- 1. 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
Correct Answer: acidophile
- 2. Generation time of Escherichia coli is
Options- A. 20 minutes
- B. 20 hours
- C. 20 days
- D. 200 hours Discuss
Correct Answer: 20 minutes
- 3. 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
Correct Answer: all of these
- 4. 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
Correct Answer: all of these
- 5. 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
Correct Answer: doesn't use oxygen but can grow in the presence of oxygen
- 6. 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
Correct Answer: Trubidostat
- 7. 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
Correct Answer: lesser than the lag phase
- 8. 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
Correct Answer: an archaean
- 9. The term facultative 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 absent
- D. requires less oxygen than is present in air Discuss
Correct Answer: uses oxygen when present or grows without oxygen when absent
- 10. Starvation proteins are produced by a culture during which of the following segments of the growth curve?
Options- A. Lag phase
- B. Exponential phase
- C. Stationary phase
- D. Death phase Discuss
Correct Answer: Stationary phase
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