logo

CuriousTab

CuriousTab

Discussion


Home Biochemical Engineering Fermentation Reactors Comments

  • Question
  • Yield coefficient represents


  • Options
  • A. total biomass or product produced
  • B. conversion efficiency of a substrate into product
  • C. conversion rate of a substrate into biomass or product
  • D. production time of biomass or product

  • Correct Answer
  • conversion efficiency of a substrate into product 


  • Fermentation Reactors problems


    Search Results


    • 1. Formation of end product by Lactococcus lactis will become non-growth associated as lactic acid accumulates because

    • Options
    • A. cells will redirect ATP to anabolism
    • B. cells will redirect NAD+ to anabolism
    • C. cells will redirect ATP to facilitate the diffusion of lactic acid and H+ out of the cells
    • D. cells will redirect ATP to the active transport of lactic acid and H+ out of the cells
    • Discuss
    • 2. A continuous reactor has a dilution rate of 0.5 h-1. Its residence time would be

    • Options
    • A. ln(2)/0.5
    • B. ln(2) x 0.5
    • C. 0.5 h
    • D. 2 h
    • Discuss
    • 3. Mixing per unit volume is observed to be poorest in

    • Options
    • A. continuous packed bed reactor
    • B. continuous fluidized bed bioreactor
    • C. continuous airlift bioreactor
    • D. none of the above
    • Discuss
    • 4. A Bacillus sp. produces an antibiotic only during the stationary phase when grown in a batch culture. If grown in a 5 litre continuous culture, the steady state productivity of the antibiotic

    • Options
    • A. will increase until the culture washes out
    • B. will decrease after washout
    • C. will be zero
    • D. will be infinite
    • Discuss
    • 5. Saccharomyces cerevisiae produces high biomass yields at low glucose concentrations and high dissolved oxygen concentrations. Which of the following should be followed for maximizing its biomass productivity?

    • Options
    • A. Batch fermenter with a high initial glucose concentration
    • B. Continuous fermenter with a low initial glucose concentration
    • C. Fed batch fermenter
    • D. All of the above
    • Discuss
    • 6. A continuous bioreactor in which only the flow rate is used to control the rate of cell or product productivity is called

    • Options
    • A. turbidostat
    • B. chemostat
    • C. level stat
    • D. pH
    • Discuss
    • 7. 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
    • 8. A fed-batch reactor initially contains 2 litre of medium. If it was fed at 1 litre per hour, then after 10 hours, the volume of the reactor will be

    • Options
    • A. 1 litre
    • B. 2 litre
    • C. 3 litre
    • D. 13 litre
    • Discuss
    • 9. When two populations compete for a single growth limiting substrate in a continuous fermenter, which organism would not be washed out?

    • Options
    • A. Organism maintaining the highest substrate concentration
    • B. Organism maintaining the lowest substrate concentration
    • C. Both (a) and (b)
    • D. Organism maintaining the moderate substrate concentration
    • Discuss
    • 10. In fed-batch fermentation, mass of substrate utilized is calculated using the relationship

    • Options
    • A. initial mass of substrate in the reactor + final mass of substrate in the reactor + flow rate x [substrate in the feed]
    • B. initial mass of substrate in the reactor - final mass of substrate in the reactor + flow rate x [substrate in the feed]
    • C. initial mass of substrate in the reactor + final mass of substrate in the reactor - flow rate x [substrate in the feed]
    • D. initial mass of substrate in the reactor + final mass of substrate in the reactor - flow rate
    • Discuss


    Comments

    There are no comments.

Enter a new Comment