Industrial Biotechnology MCQs

Question 1

Beer is a product of

Accepted Answer

Fermentation of barley grains by yeasts

Answer

Fermentation of fruits

Answer

Fermentation brought about by molds

Answer

Fermentation of hops

Question 2

Production of citric acid is inhibited by

Accepted Answer

Sodium azide

Answer

Thioglycolate

Answer

Sodium cyanide

Answer

None of the above

Question 3

The media for large scale industrial fermentation process usually

Accepted Answer

Consist of waste products from other processes, such as grain milling

Answer

Use highly purified carbon sources

Answer

Do not require a nitrogen source because the atmosphere provides nitrogen

Answer

All the above

Question 4

In a batch reactor, which one of the following is true regarding specific growth rate?

Accepted Answer

It reache s a maximum in the exponential phase

Answer

It remains constant with time

Answer

It continuously increases with time

Answer

It continuously decreases with time

Question 5

The toxicity of weak organic acids to microbial cells

Accepted Answer

Enhances as the pH falls

Answer

Decreases as the pH falls

Answer

Is not affected by pH

Answer

Is highest at pH 7.0

Question 6

In a chemostat, which one of the following would increase the exit cell concentration

Accepted Answer

Increase in inlet substrate concentration

Answer

Increase in dilution rate

Answer

Increase in inoculum size

Answer

Increase in impeller size

Question 7

Calyculins are natural products originally isolated from the marine

Accepted Answer

Sponges

Answer

Mollusc

Answer

Sea-weeds

Answer

Mangrove

Question 8

Which was the first amino acid to be commercially produced by microbial fermentation?

Accepted Answer

L-Iysine

Answer

L-Ieucine

Answer

L-serine

Answer

L-glutamic acid

Question 9

Which one of the following is most widely used for commercial production of citric acid?

Accepted Answer

Aspergillus niger

Answer

Penicillium citrinum

Answer

Gibberella fujikuori

Answer

None of the above