200 Best MCQs on Fermentation Reactors- biochemical engineering
Q57). Which of the following is best described as secondary metabolite?
a).Acetic acid produced from the oxidation of ethanol
b).Ethanol from the fermentation of glucose
c).Penicillin
d).Citric acid from the partial oxidation of glucose
Correct Answer:
Penicillin
Explaination:
Q58). A microorganism which is subjected to the Crabtree effect is most likely to
a).ferment in the presence of low concentrations of sugar and dissolved oxygen
b).respire in the presence of low sugar and high dissolved oxygen concentrations
c).ferment in the presence of high concentrations of sugar and dissolved oxygen
d).respire in the presence of high sugar and low dissolved oxygen concentrations
Correct Answer:
ferment in the presence of high concentrations of sugar and dissolved oxygen
Explaination:
Q59). When the product formation is approximately equal to the rate of cell growth, the pattern of product formation is termed as
a).uncoupled
b).growth associated
c).non-growth associated
d).metabolically uncoupled
Correct Answer:
growth associated
Explaination:
Q60). Which of the following would be correct concerning the concentration of biomass (X). growth limiting substrate (S) and product (P) in a chemostat when the cells have been washed out?
a).X,S and P will be zero
b).X,S and P can not be predicted for the above condition
c).X and P will be zero while S is equal to the substrate concentration in feed
d).None of the above
Correct Answer:
X and P will be zero while S is equal to the substrate concentration in feed
Explaination:
Q61). Pseudomonas aeruginosa has a maximum specific growth rate of 0.8 h^-1 in a medium with glucose as a growth limiting substrate. To prevent wash out, the dilution rate must be set to
a).greater than 0.8 h^-1
b).less than 0.8 h^-1
c).equal to 0.8 h^-1
d).1.6 h^-1
Correct Answer:
less than 0.8 h^-1
Explaination:
Q62). Saccharomyces cerevisiae when grown in high glucose concentration medium, the cells activity depends on which of the following?
a).High concentration of dissolved oxygen
b).Low concentration of dissolved oxygen
c).No effect of dissolved oxygen
d).High concentration of dissolved oxygen and sodium salts
Correct Answer:
No effect of dissolved oxygen
Explaination:
Q63). Continuous culture has an advantage over to a batch cultures as
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
d).all of the above
Correct Answer:
all of the above
Explaination:
Q64). In the batch-fed mode, substrate will be added
a).only at the beginning of the fermentation process
b).periodically throughout the fermentation process
c).only at the end of the fermentation process
d).substrate is never added
Correct Answer:
only at the end of the fermentation process
Explaination: