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Biochemical Engineering Objective Questions { Fermentation Reactors }

8. Formation of end product by Lactococcus lactis will become non-growth associated as lactic acid accumulates because
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
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9. Which of the following would not be subjected to the "glucose effect"?
A.Aspergillus fumigatus
B.Saccharomyces cerevisiae
C.Escherichia coli
D.Aspergillus niger
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10. Immobilized cell reactors for wastewater treatment have the advantage of having/being
A.higher cell concentration
B.more stable and prevent w
C.higher dilution rate before the cells washout
D.all of the above
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11. Which of the statement is true for continuous reactor at steady state?
A.The rates of biomass, substrate and product concentrations are zero
B.Biomass, substrate and product concentrations are zero
C.Biomass, substrate and product concentrations do not change with time
D.Biomass, substrate and product concentrations change with time
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12. A continuous bioreactor in which only the flow rate is used to control the rate of cell or product productivity is called
C.level stat
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13. For organisms growing in a chemostat, the specific growth rate
A.cannot be determined
B.can be determined from the dilution rate
C.equals to the maximum specific growth rate of the culture
D.none of the above
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14. Saccharomyces cerevisiae is being grown in a chemostat converts glucose to biomass, ethanol, glycerol and carbon dioxide. At steady state, the concentration of glucose, biomass, ethanol and glycerol will
A.decrease with time
B.increase with time
C.be constant
D.change randomly with time
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