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Fermentation Kinetics Online Exam Quiz

Important questions about Fermentation Kinetics. Fermentation Kinetics MCQ questions with answers. Fermentation Kinetics exam questions and answers for students and interviews.

1. 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

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

3. 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

4. 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

5. 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

6. The height to diameter ratio (H/D) for the column fermenters is

Options

A : <3

B : >3

C : <1.5

D : >1.5

7. 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

8. 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

9. 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 /?

10. 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

1. 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

2. Diauxie is

Options

A : growth factors

B : microbiological die off

C : the simultaneous uptake of nutrients

D : the stagewise uptake of nutrients

3. 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

4. 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

5. 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

6. In an airlift bioreactor, the spent gases released from the liquid are called

Options

A : downcomer

B : disengagement zone

C : air riser

D : flotsam

7. The function(s) of the draft tube in an airlift bioreactor is

Options

A : to reduce bubble coalescence

B : to improve circulation

C : to even out shear conditions throughout the reactor

D : all of the above

8. 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

9. Fermentor should be filled with medium upto

Options

A : 65-70%

B : 70-75%

C : 75-80%

D : 80-85%

10. 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

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