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11. The production of an amylase from starch by Aspergillus niger is often performed in a fed-batch fermenter. This is due to the reason that
A. fed-batch reactor can be used to minimize starch concentrations and prevent a. niger from fermenting
B. fed-batch reactor can be used to minimize starch concentrations and thus reduce the viscosity of the medium
C. continuous reactor can be used to minimize starch concentrations and their inhibitory effects
D. all of the above
12. The fastest route of NADH reoxidation is
A. aerobic respiration
B. anaerobic respiration
C. fermentation
D. decomposition
13. In fed-batch bioreactor modeling, the rate of change in the bioreactor volume is assumed to be equal to
A. flow rate
B. initial volume
C. volume of solids in the reactor
D. none of these
14. Monoclonal antibodies are typically produced in fed-batch reactors because
A. hybridoma cells ferment at high maltose concentrations
B. hybridoma cells yield higher lactate at high glucose concentrations
C. hybridoma cells respire at high glucose concentrations
D. none of the above
15. In plug flow tubular reactor the axial velocity profile on the cross-section will be
A. constant
B. varying with time
C. non-linear
D. power function of time
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