Growth and Nutrition of Bacteria problems
- 1. Pseudomonas pseudoflava can grow as
Options- A. chemo-lithotrophs
- B. chemo-organotrophs
- C. both (a) and (b)
- D. none of these Discuss
Correct Answer: both (a) and (b)
- 2. A synergistic effect is observed when
Options- A. one organism removes an inhibitory substance for another
- B. one organism produces a growth factor utilized by another
- C. microbial alteration of pH, aw, Eh favours the growth of another
- D. all of the above Discuss
Correct Answer: all of the above
- 3. The organism which obtain their energy from chemicals are designated as
Options- A. prototrophs
- B. chemotrophs
- C. organotrophs
- D. autotrophs Discuss
Correct Answer: chemotrophs
- 4. Organisms such as lactobacilli that have elaborate requirements for specific nutrients i.e. vitamins and other growth promoting substances, are generally called as
Options- A. fastidious hetrotrophs
- B. chemo-lithotrophs
- C. chemotrophs
- D. photo-organotrophs Discuss
Correct Answer: fastidious hetrotrophs
- 5. The growth is normally expressed as __________ in turbidimetric measurement
Options- A. cells per ml
- B. cfu/ml
- C. optical density
- D. mg N2 /ml Discuss
Correct Answer: optical density
- 6. The equation used to obtain bacterial population by binary fission is
Options- A. N = No2n
- B. log N/No = (0.3010) n
- C. log(N/No) = nlog 2
- D. All of these Discuss
Correct Answer: All of these
- 7. In the exponential phase, the cells and cell mass
Options- A. first increases then decreases
- B. decreases
- C. are constant
- D. double at a constant rate Discuss
Correct Answer: double at a constant rate
- 8. Bacteria and fungi multiply best
Options- A. below 16°C
- B. between 16-38°C
- C. above 38°C
- D. none of these Discuss
Correct Answer: between 16-38°C
- 9. A spore differs from an actively replicating bacterium in that the spore
Options- A. is produced during a process involving asymmetric division
- B. is able to withstand more extreme conditions than the replicating cell
- C. is metabolically inactive
- D. all of the above Discuss
Correct Answer: all of the above
- 10. Which of the following organisms typically get their carbon for biosynthesis from organic compounds?
Options- A. Aerobic, glucose-respiring bacteria (aerobic respiration)
- B. Ammonia-oxidizing bacteria (chemolithotrophic bacteria)
- C. Photosynthetic cyanobacteria (phototrophic metabolism)
- D. None of the above Discuss
Correct Answer: Aerobic, glucose-respiring bacteria (aerobic respiration)
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