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Home
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Biochemical Engineering
‣
Fermentation Kinetics
Comments
Question
A mixed fermentation is one, which produces
Options
A. both alcohol and carbon dioxide
B. both acid and carbon dioxide
C. both acid and alcohol
D. several different kinds of acid
Correct Answer
both acid and alcohol
Fermentation Kinetics problems
Search Results
1. Which of the following is an example of a mathematical model?
Options
A. Volume of cuboid = length x breadth x height
B. The Monod Model
C. The Michaelis Menten Equation
D. All of the above
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Discuss
Correct Answer: All of the above
2. The dilution rate, D is defined as(where
F
= volumetric flow rate,
V
R
= total volume of culture in the reactor and ? specific growth rate)
Options
A.
F
/
V
R
B.
V
R
/
F
C. ?/
F
D.
F
/?
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Discuss
Correct Answer:
F
/
V
R
3. Biomass concentrations during fermentation is
Options
A. diluting the samples to optical density less than 0.3
B. monitored by controlling the changes in biomass concentrations
C. considering that optical density is proportional to the surface area of the biomass in the sample
D. all of the above
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Discuss
Correct Answer: all of the above
4. In the stationary phase
Options
A. growth is proportional to death
B. growth rate is equal to death rate
C. growth rate is lesser than death rate
D. no co-relation exist between death rate and growth rate
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Correct Answer: growth rate is equal to death rate
5. The height to diameter ratio (H/D) for the column fermenters is
Options
A. <3
B. >3
C. <1.5
D. >1.5
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Correct Answer: >3
6. Diauxie is
Options
A. growth factors
B. microbiological die off
C. the simultaneous uptake of nutrients
D. the stagewise uptake of nutrients
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Correct Answer: the stagewise uptake of nutrients
7. The maximum specific growth rate (?
m
) of an organism in batch culture is equal to slope of a plot of
Options
A. In [biomass] against time for exponential phase data only
B. In [biomass] against time
C. biomass against time
D. biomass against time for stationary phase data only
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Correct Answer: In [biomass] against time for exponential phase data only
8. The phenomenon in which substrates are used in a sequential manner is known as
Options
A. trans-substrate genesis
B. dialism
C. diauxie
D. multiplicity
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Correct Answer: diauxie
9. An open system in which the growth rate is maintained by the removal and addition of media at such a rate as to maintain a constant cell density is called a
Options
A. manostat
B. chemostat
C. turbidostat
D. culturostat
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Correct Answer: turbidostat
10. In an airlift bioreactor, the spent gases released from the liquid are called
Options
A. downcomer
B. disengagement zone
C. air riser
D. flotsam
Show Answer
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Correct Answer: disengagement zone
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Enzymes and Kinetics
Fermentation Kinetics
Fermentation Reactors
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Immobilized Enzyme
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