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Biochemical Engineering
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Fermentation Kinetics
Comments
Question
In the accelerated phase, cell starts to
Options
A. increase and the division rate increases to reach a maximum
B. decrease and the division rate increases to reach a maximum
C. increase and the division rate decreases to reach a maximum
D. increase and the division rate increases to reach a minimum
Correct Answer
increase and the division rate increases to reach a maximum
Fermentation Kinetics problems
Search Results
1. Which of the following is not correct for the Monod model and the Michaelis Menten Model?
Options
A. The Michaelis Menten Model was derived from a curve fitting exercise
B. The Michaelis Menten model was derived from an analysis of the mechanism of microbial growth
C. The Monod model was derived from an analysis of the mechanism of microbial growth
D. All of the above
Show Answer
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Correct Answer: The Monod model was derived from an analysis of the mechanism of microbial growth
2. Wash out in steady state fermentation occurs when
Options
A. dilution rate is less than maximum specific growth rate
B. dilution rate is higher than the maximum specific growth rate
C. cell concentration reaches the maximum
D. specific growth rate is maximum
Show Answer
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Discuss
Correct Answer: dilution rate is higher than the maximum specific growth rate
3. Why a T-flask used in small-scale cell culture is incubated in a horizontal position?
Options
A. To save space
B. To increase the surface area of the liquid-air interface
C. Both (a) and (b)
D. To increase the rate of oxygen transfer into the liquid
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Correct Answer: Both (a) and (b)
4. The contents in jet loop reactor are mixed through
Options
A. compressed air
B. a mechanical agitator
C. external pumping
D. any of these
Show Answer
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Discuss
Correct Answer: external pumping
5. Bacterial growth curve is obtained by plotting
Options
A. number of cells versus time
B. number fo spores versus time
C. log of number of cells versus time
D. log of number of cells survived versus time
Show Answer
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Correct Answer: log of number of cells versus time
6. An open system in which the growth rate is maintained by adding a nutrient (present in limiting quantities) at the same rate as that medium containing micro-organisms is removed is called
Options
A. manostat
B. chemostat
C. turbidostat
D. culturostat
Show Answer
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Correct Answer: chemostat
7. The height to diameter ratio (H/D) for the column fermenters is
Options
A. <3
B. >3
C. <1.5
D. >1.5
Show Answer
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Correct Answer: >3
8. 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
9. 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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Correct Answer: all of the above
10. 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
/?
Show Answer
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Discuss
Correct Answer:
F
/
V
R
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