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MCQs

Total Questions : 146 | Page 5 of 15 pages
Question 41. Lag phase occurs mainly due to
  1.    acclimatization with new environment and substrate
  2.    higher growth temperature
  3.    substrate disliking
  4.    variation in substrate concentration
 Discuss Question
Answer: Option A. -> acclimatization with new environment and substrate
Answer: (a).acclimatization with new environment and substrate
Question 42. The advantage of airlift bioreactors over stirred tank bioreactors of a similar size is
  1.    higher oxygen transfer rates
  2.    more uniform shear conditions
  3.    both (a) and (b)
  4.    less foaming
 Discuss Question
Answer: Option C. -> both (a) and (b)
Answer: (c).both (a) and (b)
Question 43. Turbidostat is recommended when continuous fermentation needs to be carried out at
  1.    high dilution rates near the washout point
  2.    low dilution rates near the washout point
  3.    moderate dilution rates near the washout point
  4.    any intensity of dilution rates near the washout point
 Discuss Question
Answer: Option A. -> high dilution rates near the washout point
Answer: (a).high dilution rates near the washout point
Question 44. In a batch reactor specific growth rate
  1.    remains constant throughout the process
  2.    increases exponentially
  3.    changes during the fermentation
  4.    is highest during the stationary phase
 Discuss Question
Answer: Option C. -> changes during the fermentation
Answer: (c).changes during the fermentation
Question 45. Stirred tank fermenter (STF) can be employed for
  1.    aerobic fermentation of a wide range of cells including microbial, animal and plant cells
  2.    anaerobic fermentation of a wide range of cells including microbial, animal and plant cells
  3.    Both (a) and (b)
  4.    anaerobic fermentation of plant cells only
 Discuss Question
Answer: Option C. -> Both (a) and (b)
Answer: (c).Both (a) and (b)
Question 46. The height to diameter ratio (H/D) for the tank fermenters is
  1.    <3
  2.    >3
  3.    <1.5
  4.    >1.5
 Discuss Question
Answer: Option A. -> <3
Answer: (a).<3
Question 47. In an airlift bioreactor, the air sparging region is called
  1.    downcomer
  2.    disengagement zone
  3.    air riser
  4.    none of these
 Discuss Question
Answer: Option C. -> air riser
Answer: (c).air riser
Question 48. At the end of the lag phase, when growth begins, the division rate increases gradually and reaches a maximum value in the exponential growth period. This transitional period is commonly called the accelerated growth phase and is often included as a part of the
  1.    lag phase
  2.    stationary phase
  3.    death phase
  4.    exponential growth phase
 Discuss Question
Answer: Option A. -> lag phase
Answer: (a).lag phase
Question 49. The air riser is located on the outside of the draft tube for the large-scale airlift bioreactors because of
  1.    higher oxygen transfer rates
  2.    a small sparge ring
  3.    better heat transfer efficiencies
  4.    all of these
 Discuss Question
Answer: Option C. -> better heat transfer efficiencies
Answer: (c).better heat transfer efficiencies
Question 50. The relatively large volume (10 to 40% of total fermenter volume) of the seed culture is employed to
  1.    increase the overall fermentation time
  2.    increase the overall yield of biomass
  3.    decrease the overall fermentation time
  4.    decrease the overall yield of product
 Discuss Question
Answer: Option C. -> decrease the overall fermentation time
Answer: (c).decrease the overall fermentation time

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