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- Question
If the specific growth rate, ?. is constant with time during the exponential growth period, the equation correlating bacterial number density Cn), cell number concentration with respect to time can be expressed as
Options- A. Cn= Cn0 exp[? (t - t0)]
- B. Cn0 = Cn exp[? (t - t0)]
- C. Cn/Cn0 =(1/?)exp(t-t0)
- D. Cn0 / Cn = (1/?)exp(t-t0)
- Correct Answer
- Cn= Cn0 exp[? (t - t0)]
- 1. If biomass yields are constant, then the biomass productivity of a culture grown in continuous reactor will
Options- A. always decrease with dilution rate
- B. increase with dilution rate until washout
- C. remain constant irrespective of the dilution rate
- D. decrease with dilution rate until washout Discuss
- 2. Pluronic F68 is added to cell culture media as
Options- A. a nutrient
- B. a shear protectorant
- C. to increase oxygen transfer rates
- D. all of these Discuss
- 3. The increased air flow rate in bubble column fermenter can cause excessive foaming and high retention of air bubbles in the column which
Options- A. decreases the productivity of the fermenter
- B. increases the productivity of the fermenter
- C. modestly increases the productivity of the fermenter
- D. does not affect on the productivity Discuss
- 4. The cellular productivity in a continuous stirred tank fermenter (CSTF) increases with an increase in the dilution rate and reaches a maximum value. If the dilution rate is increased beyond the maximum point, the productivity will
Options- A. decrease abruptly
- B. increase
- C. increase drastically
- D. be zero Discuss
- 5. Sanitizers used for rubber made equipments are
Options- A. strong acids
- B. strong alkalis
- C. combination of both
- D. none of these Discuss
- 6. The viscosity of water at STP is approximately
Options- A. 0.005 kg.m-1.s-1
- B. 0.001 kg.m-1.s-1
- C. 0.003 kg.m-2.s-1
- D. 0.1 g.cm-1.s-1 Discuss
- 7. The collection efficiency by diffusion increases with
Options- A. decreasing particle size
- B. decreasing air velocity
- C. both (a) and (b)
- D. increasing particle size Discuss
- 8. Which of the following activity is possible by transferases?
Options- A. Transfer of methyl groups
- B. Transfer of glycosyl group
- C. Both (a) and (b)
- D. None of these Discuss
- 9. Bacterial growth curve is obtained by plotting
Options- A. number of cells versus time
- B. number fo spores versus time
- C. log of number of cells versus time
- D. log of number of cells survived versus time Discuss
- 10. The fastest route of NADH reoxidation is
Options- A. aerobic respiration
- B. anaerobic respiration
- C. fermentation
- D. decomposition Discuss
More questions
Correct Answer: increase with dilution rate until washout
Correct Answer: a shear protectorant
Correct Answer: decreases the productivity of the fermenter
Correct Answer: decrease abruptly
Correct Answer: strong alkalis
Correct Answer: 0.001 kg.m-1.s-1
Correct Answer: both (a) and (b)
Correct Answer: Both (a) and (b)
Correct Answer: log of number of cells versus time
Correct Answer: fermentation
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