Fermentation Reactors – Section 1

1. Yield coefficient represents

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: B. conversion efficiency of a substrate into product

2. The lowest biomass yield in a culture of Escherichia coli will be in

A. an aerated batch culture containing an initial high concentration of glucose
B. an aerated batch reactor containing an initial low concentration of glucose
C. an aerated fed-batch reactor having a low glucose concentration
D. an aerated continuous reactor having a low glucose concentration

Correct Answer: A. an aerated batch culture containing an initial high concentration of glucose

3. When two populations compete for a single growth-limiting substrate in a continuous fermenter, which organism would not be washed out?

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

Correct Answer: B. Organism maintaining the lowest substrate concentration

4. The continuous cultures are not widely used in industry because

A. they are not suited for the production of secondary metabolites
B. contamination or mutation can have a disastrous effect on the operation
C. the government will not approve the licensing of pharmaceuticals produced in continuous cultures
D. all of the above

Correct Answer: D. all of the above

5. The lowest yield of ATP /is in

A. fermentation
B. aerobic respiration
C. anaerobic respiration
D. same in (a), (b) and (c)

Correct Answer: A. fermentation

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