Correct Answer: yeast cells respire at low glucose concentrations
3. Continuous culture has an advantage over to a batch cultures as
Options
A. continuous reactors do not need to be shut down and cleaned as regularly as a batch reactor
B. most downstream and upstream processes are continuous in nature and thus the operation of continuous bioreactor can be better integrated into the overall manufacturing process
C. cells can be maintained at a constant physiological state simply by setting the dilution rate
5. Production of organic acids in batch culture is generally growth associated phase followed by non-growth associated production. The probable reason for this is that
Options
A. organic acids uncouple catabolism from anabolism
B. biomass yields increase as the fermentation proceeds
C. organic acids are secondary metabolites
D. high concentrations of organic acid promote the growth of the microbial population