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Biochemical Engineering
‣
Fermentation Kinetics
Comments
Question
The function of the disengagement zone in an airlift fermenter is to
Options
A. prevent CO
2
rich bubbles from entering the downcomer
B. reduce the velocity of the bubbles
C. reduce liquid loss as aerosols
D. all of the above
Correct Answer
all of the above
Fermentation Kinetics problems
Search Results
1. The region of an airlift bioreactor in which the liquid travels in a downward direction is called the
Options
A. downcomer
B. disengagement zone
C. air riser
D. flotsam
Show Answer
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Discuss
Correct Answer: downcomer
2. When intracellular enzymes of whole cells are to be used in a bio-conversion process, it is often necessary to____________the cells.
Options
A. permeabilize
B. lyophilize
C. heat-kill
D. denature
Show Answer
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Correct Answer: permeabilize
3. In the death phase
Options
A. nutrients available for the cells are depleted and begin to die
B. the number of viable cells will increase
C. nutrients available for cells are replenished and start to multiply
D. none of the above
Show Answer
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Correct Answer: nutrients available for the cells are depleted and begin to die
4. Fermentor should be filled with medium upto
Options
A. 65-70%
B. 70-75%
C. 75-80%
D. 80-85%
Show Answer
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Correct Answer: 75-80%
5. Bubble column reactor has
Options
A. large height to diameter ratio
B. small height to diameter ratio
C. large diameter to height ratio
D. small diameter to height ratio
Show Answer
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Correct Answer: large height to diameter ratio
6. Chemostats work on the principle of
Options
A. maintaining constant volume of culture medium
B. maintaining continuous flow of nutrients
C. maintaining uniform nutrients concentration
D. operating at higher pressure
Show Answer
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Correct Answer: maintaining uniform nutrients concentration
7. Population doubling time, t
d
can be expressed as (where ? is the specific growth rate.)
Options
A. log2/?
B. ln2/?
C. ?/ln2
D. ?/log2
Show Answer
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Correct Answer: ln2/?
8. The monod model predicts that the specific growth rate
Options
A. will increase with the concentration of the growth limiting substrate until it reaches a maximum value
B. will decrease with the concentration of the growth limiting substrate
C. will increase with the concentration of the growth limiting substrate
D. does not depend on growth limiting substrate
Show Answer
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Correct Answer: will increase with the concentration of the growth limiting substrate until it reaches a maximum value
9. The specific growth rate (?) is defined as
Options
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
Show Answer
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Correct Answer: the rate of individual cells division or increase in their biomass
10. During the exponential phase the maximum specific growth rate equals specific growth rate as
Options
A. concentration of the growth limiting substrate is much less than the monod constant
B. concentration of growth limiting substrate is much greater than the monod constant
C. specific growth rate increases exponentially
D. concentration of the growth limiting substrate is equal to the monod constant
Show Answer
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Correct Answer: concentration of growth limiting substrate is much greater than the monod constant
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More in Biochemical Engineering:
Agitation and Aeration
Downstream Processing
Enzymes and Application
Enzymes and Kinetics
Fermentation Kinetics
Fermentation Reactors
Fluid Flow
Immobilized Enzyme
Sterilization
Water Treatment