Fermentation Kinetics problems
- 1. A mixed fermentation is one, which produces
Options- A. both alcohol and carbon dioxide
- B. both acid and carbon dioxide
- C. both acid and alcohol
- D. several different kinds of acid Discuss
Correct Answer: both acid and alcohol
- 2. Diauxie is
Options- A. growth factors
- B. microbiological die off
- C. the simultaneous uptake of nutrients
- D. the stagewise uptake of nutrients Discuss
Correct Answer: the stagewise uptake of nutrients
- 3. The maximum specific growth rate (?m) of an organism in batch culture is equal to slope of a plot of
Options- A. In [biomass] against time for exponential phase data only
- B. In [biomass] against time
- C. biomass against time
- D. biomass against time for stationary phase data only Discuss
Correct Answer: In [biomass] against time for exponential phase data only
- 4. The phenomenon in which substrates are used in a sequential manner is known as
Options- A. trans-substrate genesis
- B. dialism
- C. diauxie
- D. multiplicity Discuss
Correct Answer: diauxie
- 5. An open system in which the growth rate is maintained by the removal and addition of media at such a rate as to maintain a constant cell density is called a
Options- A. manostat
- B. chemostat
- C. turbidostat
- D. culturostat Discuss
Correct Answer: turbidostat
- 6. In an airlift bioreactor, the spent gases released from the liquid are called
Options- A. downcomer
- B. disengagement zone
- C. air riser
- D. flotsam Discuss
Correct Answer: disengagement zone
- 7. The function(s) of the draft tube in an airlift bioreactor is
Options- A. to reduce bubble coalescence
- B. to improve circulation
- C. to even out shear conditions throughout the reactor
- D. all of the above Discuss
Correct Answer: all of the above
- 8. Bubble column reactor has
Options- A. large height to diameter ratio
- B. small height to diameter ratio
- C. large diameter to height ratio
- D. small diameter to height ratio Discuss
Correct Answer: large height to diameter ratio
- 9. Fermentor should be filled with medium upto
Options- A. 65-70%
- B. 70-75%
- C. 75-80%
- D. 80-85% Discuss
Correct Answer: 75-80%
- 10. In the death phase
Options- A. nutrients available for the cells are depleted and begin to die
- B. the number of viable cells will increase
- C. nutrients available for cells are replenished and start to multiply
- D. none of the above Discuss
Correct Answer: nutrients available for the cells are depleted and begin to die
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