Questions and answers for exam Preparation

MCQs

Total Questions : 114 | Page 3 of 12 pages

Question 21. Yield coefficient represents

total biomass or product produced
conversion efficiency of a substrate into product
conversion rate of a substrate into biomass or product
production time of biomass or product

Discuss Question

Answer: Option B. -> conversion efficiency of a substrate into product
Answer: (b).conversion efficiency of a substrate into product

Question 22. The continuous cultures are not widely used in industry because

they are not suited for the production of secondary metabolites
contamination or mutation can have a disastrous effect on the operation
the government will not approve the licensing of pharmaceuticals produced in continuous cultures
all of the above

Discuss Question

Answer: Option D. -> all of the above
Answer: (d).all of the above

Question 23. When two populations compete for a single growth limiting substrate in a continuous fermenter, which organism would not be washed out?

Organism maintaining the highest substrate concentration
Organism maintaining the lowest substrate concentration
Both (a) and (b)
Organism maintaining the moderate substrate concentration

Discuss Question

Answer: Option B. -> Organism maintaining the lowest substrate concentration
Answer: (b).Organism maintaining the lowest substrate concentration

Question 24. The lowest yield of ATP /is in

fermentation
aerobic respiration
anaerobic respiration
same in (a), (b) and (c)

Discuss Question

Answer: Option A. -> fermentation
Answer: (a).fermentation

Question 25. The lowest biomass yield in a culture of Escherichia coli will be in

an aerated batch culture containing a initial high concentration of glucose
an aerated batch reactor containing an initial low concentration of glucose
an aerated fed-batch reactor having a low glucose concentration
an aerated continuous reactor having a low glucose concentration

Discuss Question

Answer: Option A. -> an aerated batch culture containing a initial high concentration of glucose
Answer: (a).an aerated batch culture containing a initial high concentration of glucose

Question 26. Unsteady state mass balance for dynamic model of continuous stirred tank reactor (CSTR) is

time rate of total amount in rector = rate of addition to reactor -rate of removal + rate of formation
total amount in rector = rate of addition to reactor - rate of removal + rate of formation
rate of total amount in rector = rate of addition to reactor - rate of removal + rate of formation
none of the above

Discuss Question

Answer: Option A. -> time rate of total amount in rector = rate of addition to reactor -rate of removal + rate of formation
Answer: (a).time rate of total amount in rector = rate of addition to reactor -rate of removal + rate of formation

Question 27. A fed-batch reactor initially contains 2 litre of medium. If it was fed at 1 litre per hour, then after 10 hours, the volume of the reactor will be

1 litre
2 litre
3 litre
13 litre

Discuss Question

Answer: Option B. -> 2 litre
Answer: (b).2 litre

Question 28. A Bacillus sp. produces an antibiotic only during the stationary phase when grown in a batch culture. If grown in a 5 litre continuous culture, the steady state productivity of the antibiotic

will increase until the culture washes out
will decrease after washout
will be zero
will be infinite

Discuss Question

Answer: Option C. -> will be zero
Answer: (c).will be zero

Question 29. In a fluidized bed reactor, the function of the disengagement zone is to

reduce loss of particles from the reactor
reduce the velocity of the particles near the surface of the reactor
reduce foaming problems
all of the above

Discuss Question

Answer: Option D. -> all of the above
Answer: (d).all of the above

Question 30. Saccharomyces cerevisiae produces high biomass yields at low glucose concentrations and high dissolved oxygen concentrations. Which of the following should be followed for maximizing its biomass productivity?