Biochemical Engineering

Question: Fluidized bed bioreactors provide higher mass transfer rates than packed bed bioreactors because
[A].

mixing is higher in fluidized bed bioreactors

[B].

particles move with the fluid in a fluidized bed bioreactor

[C].

immobilized particles are smaller in the fluidized bed bioreactors

[D].

all of the above

Answer: Option B

Explanation:

No answer description available for this question.

Question: Mixing per unit volume is observed to be poorest in
[A].

continuous packed bed reactor

[B].

continuous fluidized bed bioreactor

[C].

continuous airlift bioreactor

[D].

none of the above

Answer: Option A

Explanation:

No answer description available for this question.

Question: Monoclonal antibodies are typically produced in fed batch reactors because
[A].

hybridoma cells ferment at high maltose concentrations

[B].

hybridoma cells yield higher lactate at high glucose concentrations

[C].

hybridoma cells respire at high glucose concentrations

[D].

none of the above

Answer: Option B

Explanation:

No answer description available for this question.

Question: The main reason for production of antibiotics in fed batch reactors is
[A].

the presence of precursors is often toxic to the cells

[B].

higher yields when cells enter the stationary phase

[C].

higher yields when cell growth slows

[D].

all of the above

Answer: Option D

Explanation:

No answer description available for this question.

Question: Yeast is typically produced in fed batch reactors because
[A].

yeast cells produce ethanol at low glucose concentrations

[B].

yeast cells ferment at low glucose concentrations

[C].

yeast cells respire at low glucose concentrations

[D].

all of the above

Answer: Option C

Explanation:

No answer description available for this question.

Question: Fed batch reactors is used to produce vinegar because
[A].

it can maintain low ethanol concentrations

[B].

it can maintain low acetic acid concentrations

[C].

acetic acid bacteria tend to ferment at high ethanol concentrations

[D].

all of the above

Answer: Option A

Explanation:

No answer description available for this question.

Question: The production of an amylase from starch by Aspergillus niger is often performed in a fed batch fermenter. This is due to the reason that
[A].

fed-batch reactor can be used to minimize starch concentrations and prevent a. niger from fermenting

[B].

fed-batch reactor can be used to minimize starch concentrations and thus reduce the viscosity of the medium

[C].

continuous reactor can be used to minimize starch concentrations and their inhibitory effects

[D].

all of the above

Answer: Option B

Explanation:

No answer description available for this question.

Question: In the batch-fed mode, substrate will be added
[A].

only at the beginning of the fermentation process

[B].

periodically throughout the fermentation process

[C].

only at the end of the fermentation process

[D].

substrate is never added

Answer: Option C

Explanation:

No answer description available for this question.