Biochemical Engineering - Fermentation Reactors

Exercise :: Fermentation Reactors - Section 1

31. 

The main reason for production of antibiotics in fed batch reactors is

A. the presence of precursors is often toxic to the cells
B. higher yields when cells enter the stationary phase
C. higher yields when cell growth slows
D. all of the above

Answer: Option D

Explanation:

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32. 

Fed batch reactors is used to produce vinegar because

A. it can maintain low ethanol concentrations
B. it can maintain low acetic acid concentrations
C. acetic acid bacteria tend to ferment at high ethanol concentrations
D. all of the above

Answer: Option A

Explanation:

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33. 

When a culture of fermenting yeast becomes metabolically uncoupled, ethanol

A. becomes a secondary metabolite
B. production becomes growth associated
C. production becomes non-growth associated
D. becomes a growth nutrient

Answer: Option C

Explanation:

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34. 

Mixing profiles closest to plug flow are observed in

A. continuous packed bed reactor
B. stirred tank reactor with biomass recycles
C. continuous fluidized bed bioreactor
D. all of these

Answer: Option A

Explanation:

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35. 

On a glucose medium, the growth of an organism is characterized by the following Monod model and stoichiometric parameters μm = 0.3 h-1, Ks =0.05 g.l-1 and Yxs = 0.3 g.g-1 When this organism is grown in a 2 litre continuous on a medium containing 10 g.l-1 of glucose added at 1 l.h-1, the steady state concentration of biomass in the reactor will be

A. 0 g.l-1
B. 0.4 g.l-1
C. 0.5 g.l-1
D. 10 g.l-1

Answer: Option A

Explanation:

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