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MCQs

Total Questions : 146 | Page 2 of 15 pages
Question 11. In the death phase
  1.    nutrients available for the cells are depleted and begin to die
  2.    the number of viable cells will increase
  3.    nutrients available for cells are replenished and start to multiply
  4.    none of the above
 Discuss Question
Answer: Option A. -> nutrients available for the cells are depleted and begin to die
Answer: (a).nutrients available for the cells are depleted and begin to die
Question 12. Which of the following is not correct for the Monod model and the Michaelis Menten Model?
  1.    The Michaelis Menten Model was derived from a curve fitting exercise
  2.    The Michaelis Menten model was derived from an analysis of the mechanism of microbial growth
  3.    The Monod model was derived from an analysis of the mechanism of microbial growth
  4.    All of the above
 Discuss Question
Answer: Option C. -> The Monod model was derived from an analysis of the mechanism of microbial growth
Answer: (c).The Monod model was derived from an analysis of the mechanism of microbial growth
Question 13. Why a T-flask used in small-scale cell culture is incubated in a horizontal position?
  1.    To save space
  2.    To increase the surface area of the liquid-air interface
  3.    Both (a) and (b)
  4.    To increase the rate of oxygen transfer into the liquid
 Discuss Question
Answer: Option C. -> Both (a) and (b)
Answer: (c).Both (a) and (b)
Question 14. The maximum specific growth rate of an organism depends on
  1.    medium composition
  2.    temperature
  3.    pH
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Answer: (d).All of these
Question 15. Bubble column reactor has
  1.    large height to diameter ratio
  2.    small height to diameter ratio
  3.    large diameter to height ratio
  4.    small diameter to height ratio
 Discuss Question
Answer: Option A. -> large height to diameter ratio
Answer: (a).large height to diameter ratio
Question 16. Bacterial growth curve is obtained by plotting
  1.    number of cells versus time
  2.    number fo spores versus time
  3.    log of number of cells versus time
  4.    log of number of cells survived versus time
 Discuss Question
Answer: Option C. -> log of number of cells versus time
Answer: (c).log of number of cells versus time
Question 17. Wash out in steady state fermentation occurs when
  1.    dilution rate is less than maximum specific growth rate
  2.    dilution rate is higher than the maximum specific growth rate
  3.    cell concentration reaches the maximum
  4.    specific growth rate is maximum
 Discuss Question
Answer: Option B. -> dilution rate is higher than the maximum specific growth rate
Answer: (b).dilution rate is higher than the maximum specific growth rate
Question 18. 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
  1.    manostat
  2.    chemostat
  3.    turbidostat
  4.    culturostat
 Discuss Question
Answer: Option C. -> turbidostat
Answer: (c).turbidostat
Question 19. When intracellular enzymes of whole cells are to be used in a bio-conversion process, it is often necessary to____________the cells.
  1.    permeabilize
  2.    lyophilize
  3.    heat-kill
  4.    denature
 Discuss Question
Answer: Option A. -> permeabilize
Answer: (a).permeabilize
Question 20. Fermentor should be filled with medium upto
  1.    65-70%
  2.    70-75%
  3.    75-80%
  4.    80-85%
 Discuss Question
Answer: Option C. -> 75-80%
Answer: (c).75-80%

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