Biochemical Engineering

Question: The lowest biomass yield in a culture of Escherichia coli will be in
[A].

an aerated batch culture containing a initial high concentration of glucose

[B].

an aerated batch reactor containing an initial low concentration of glucose

[C].

an aerated fed-batch reactor having a low glucose concentration

[D].

an aerated continuous reactor having a low glucose concentration

Answer: Option A

Explanation:

No answer description available for this question.

Question: Which of the following would not be subjected to the “glucose effect”?
[A].

Aspergillus fumigatus

[B].

Saccharomyces cerevisiae

[C].

Escherichia coli

[D].

Aspergillus niger

Answer: Option C

Explanation:

No answer description available for this question.

Question: Saccharomyces cerevisiae when grown in high glucose concentration medium, the cells activity depends on which of the following?
[A].

High concentration of dissolved oxygen

[B].

Low concentration of dissolved oxygen

[C].

No effect of dissolved oxygen

[D].

High concentration of dissolved oxygen and sodium salts

Answer: Option C

Explanation:

No answer description available for this question.

Question: The lowest yield of ATP /is in
[A].

fermentation

[B].

aerobic respiration

[C].

anaerobic respiration

[D].

same in (a), (b) and (c)

Answer: Option A

Explanation:

No answer description available for this question.

Question: The fastest route of NADH reoxidation is
[A].

aerobic respiration

[B].

anaerobic respiration

[C].

fermentation

[D].

decomposition

Answer: Option C

Explanation:

No answer description available for this question.

Question: Low dissolved oxygen concentrations leads to
[A].

low biomass yields

[B].

high biomass yields

[C].

no effect on biomass yields

[D].

none of the above

Answer: Option A

Explanation:

No answer description available for this question.

Question: Yield coefficient represents
[A].

total biomass or product produced

[B].

conversion efficiency of a substrate into product

[C].

conversion rate of a substrate into biomass or product

[D].

production time of biomass or product

Answer: Option B

Explanation:

No answer description available for this question.

Question: A Bacillus sp. produces an antibiotic only during the stationary phase when grown in a batch culture. If grown in a 5 litre continuous culture, the steady state productivity of the antibiotic
[A].

will increase until the culture washes out

[B].

will decrease after washout

[C].

will be zero

[D].

will be infinite

Answer: Option C

Explanation:

No answer description available for this question.

Question: A continuous reactor has a dilution rate of 0.5 h-1. Its residence time would be
[A].

ln(2)/0.5

[B].

ln(2) x 0.5

[C].

0.5 h

[D].

2 h

Answer: Option D

Explanation:

No answer description available for this question.

Question: A continuous reactor at steady state contains 0.04 g.l-1 of biomass and 0.02 g.l-1 of phenol. The feed contained 0.1 g.l-1 of phenol. The biomass yield would be
[A].

0.4 g.g-1

[B].

0.5 g.g-1

[C].

1.0 g.g-1

[D].

5.0 g.g-1

Answer: Option B

Explanation:

No answer description available for this question.