Question is ⇒ Turbidostat is recommended when continuous fermentation needs to be carried out at, Options are ⇒ (A) high dilution rates near the washout point, (B) low dilution rates near the washout point, (C) moderate dilution rates near the washout point, (D) any intensity of dilution rates near the washout point, (E) , Leave your comments or Download question paper.

Question is ⇒ Turbidostat is recommended when continuous fermentation needs to be carried out at, Options are ⇒ (A) high dilution rates near the washout point, (B) low dilution rates near the washout point, (C) moderate dilution rates near the washout point, (D) any intensity of dilution rates near the washout point, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	Turbidostat is recommended when continuous fermentation needs to be carried out at
A.	high dilution rates near the washout point [Correct Answer]
B.	low dilution rates near the washout point [Wrong Answer]
C.	moderate dilution rates near the washout point [Wrong Answer]
D.	any intensity of dilution rates near the washout point [Wrong Answer]
View Answer 1 -1 Explanation:- Answer : A Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

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⇒ Which of the following is not correct for the Monod model and the Michaelis Menten Model?
The Michaelis Menten Model was derived from a curve fitting exercise
The Michaelis Menten model was derived from an analysis of the mechanism of microbial growth
The Monod model was derived from an analysis of the mechanism of microbial growth
All of the above

⇒ The maximum specific growth rate (μ_m) of an organism in batch culture is equal to slope of a plot of
In [biomass] against time for exponential phase data only
In [biomass] against time
biomass against time
biomass against time for stationary phase data only

⇒ The monod model predicts that the specific growth rate
will increase with the concentration of the growth limiting substrate until it reaches a maximum value
will decrease with the concentration of the growth limiting substrate
will increase with the concentration of the growth limiting substrate
does not depend on growth limiting substrate

⇒ Wash out in steady state fermentation occurs when
dilution rate is less than maximum specific growth rate
dilution rate is higher than the maximum specific growth rate
cell concentration reaches the maximum
specific growth rate is maximum

⇒ The number of baffles in a standard stirred tank bioreactor is
8
6
4
2

⇒ The dilution rate, D is defined as(where F = volumetric flow rate, V_R = total volume of culture in the reactor and μ specific growth rate)
F/V_R
V_R/F
μ/F
F/μ

⇒ 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
manostat
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⇒ In the stationary phase
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growth rate is equal to death rate
growth rate is lesser than death rate
no co-relation exist between death rate and growth rate

⇒ The function of the disengagement zone in an airlift fermenter is to
prevent CO₂ rich bubbles from entering the downcomer
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reduce liquid loss as aerosols
all of the above

⇒ A mixed fermentation is one, which produces
both alcohol and carbon dioxide
both acid and carbon dioxide
both acid and alcohol
several different kinds of acid

⇒ The application of just in time (JIT) manufacturing techniques in biotechnology is important because
raw materials used in biotechnology are biodegradable
the products of biotechnology are biodegradable
it is a very competitive business (d) all of the above
all of the above

⇒ Heat transfer rates (per unit volume) will be lowest in
Stirred tank bioreactor with biomass recycle
Continuous air lift bioreactor
Continuous packed bed reactor
Continuous fluidized bed bioreactor

⇒ The air riser is located on the outside of the draft tube for the large-scale airlift bioreactors because of
higher oxygen transfer rates
a small sparge ring
better heat transfer efficiencies
all of these

⇒ Biomass concentrations during fermentation is
diluting the samples to optical density less than 0.3
monitored by controlling the changes in biomass concentrations
considering that optical density is proportional to the surface area of the biomass in the sample
all of the above

⇒ The function of a mechanical seal is to
prevent contaminants entering the reactor
prevent cells from leaving the reactor
both (a) and (b)
prevent air to enter

⇒ The height to diameter ratio (H/D) for the tank fermenters is
<3
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⇒ The contents in bubble column and air lift reactor are mixed through
compressed air
a mechanical internal moving part
external pumping
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⇒ In an airlift bioreactor, the spent gases released from the liquid are called
downcomer
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⇒ During the log phase cell numbers increase exponentially
because cells produce enzymes
because cells do not have cell membranes
because cells are autocatalysts
because the rate of cell division increases exponentially

⇒ The advantage of airlift bioreactors over stirred tank bioreactors of a similar size is
higher oxygen transfer rates
more uniform shear conditions
both (a) and (b)
less foaming

⇒ Diauxie is
growth factors
microbiological die off
the simultaneous uptake of nutrients
the stagewise uptake of nutrients

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manostat
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turbidostat
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volume of reactor
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Trickle bed reactor
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⇒ In the death phase
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nutrients available for cells are replenished and start to multiply
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changes during the fermentation
is highest during the stationary phase

⇒ The region of an airlift bioreactor in which the liquid travels in a downward direction is called the
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disengagement zone
air riser
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⇒ The specific growth rate (μ) is defined as
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rate of increase of total biomass in a reactor
the rate of individual cells division or increase in their biomass
the rate of cell death