31. Which of the following is correct for the prediction of time required in a batch fermenter?

A. Carrying out experiments
B. Mathematical modeling of the fermentation process
C. Both (a) and (b)
D. It is impossible to predict the time required for fermentation

32. In an airlift bioreactor, the spent gases released from the liquid are called

A. downcomer
B. disengagement zone
C. air riser
D. flotsam

33. The contents in the jet loop reactor are mixed through

A. compressed air
B. a mechanical agitator
C. external pumping
D. any of these

34. The specific growth rate (μ) is defined as

A. the concentration of biomass in the reactor
B. rate of increase of total biomass in a reactor
C. the rate of individual cells division or increase in their biomass
D. the rate of cell death

35. The number of baffles in a standard stirred tank bioreactor is

A. 8
B. 6
C. 4
D. 2