Microbes in Human Welfare Test

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Microbes in Human Welfare Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

Which organism is used for production of ethanol by fermentation of sulfite liquor?

A
Aspergillus niger

B
Candida utilis

C
Kluveromyces fragilis

D
Saccharomyces cerevisiae

Solution

Candida utilis is used to ferment sulfite liquor. It can ferment pentosans which is present in waste sulfite liquor.
Question 2
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Which product is obtained when Corynebacterium species is cultured with ammonia and carbohydrates from sugar beets, sugar cane, tapioca or molasses?

A
Vitamin D

B
Aspartame

C
L- glutamate

D
Threonine

Solution

Corynebacterium species,when cultured with ammonia and carbohydrates from sugar beets, sugar cane, tapioca or molasses, excrete amino acids into a culture broth from which L-glutamate is isolated.
Question 3
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Threonine operon of E.coli strains is exploited for threonine production. Which enzyme is coded by the thrB-gene of E.coli operon?

A
Homoserine dehydrogenase

B
Threonine synthase

C
Aspartate semialdehyde dehydrogenase

D
Homoserine kinase

Solution

Homoserine kinase is coded by gene thrB. It converts homoserine to homoserine phosphate.
Question 4
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Xanthomonas campestris organism is used for xanthan gum production which is used in bubble gums. Which of the following is added to the fermentor to stop the reaction once xanthan gum is obtained?

A
Isopropanol

B
Glucose

C
Lactic acid

D
Penicillin

Solution

Isopropanol or methanol is added to stop the reaction. It kills the bacteria and also helps in the precipitation of xanthan gum.
Question 5
1 / -0

During the biosynthesis of penicillin, which amino acid is added first to alpha aminoadipic acid to obtain a beta-lactam ring?

A
L-valine

B
L-cysteine

C
L-methionine

D
L-isoleucine

Solution

During the biosynthesis of penicillin, L-cysteine is added first to alpha-aminoadipic acid to obtain alpha-aminoadipic acid- L-cysteine complex, which in 3 stages yield beta-lactam ring.
Question 6
1 / -0

Zymomonas mobilis has several advantages over S. cerevisiae with respect to producing bioethanol. Which of the following is true with respect to its use for ethanol fermentation?

A
Lower ethanol tolerance

B
Can ferment xylulose and arabinose

C
High sugar uptake and ethanol yield

D
Can tolerate toxic inhibitors present in lignocellulosic hydrolysates

Solution

This is true. Zymomonas mobilis has higher sugar uptake and ethanol yield (up to 2.5 times higher)
Question 7
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In vitamin B₁₂production using Pseudomonas denitrificans, which of the following, if supplemented to the medium, would increase the yield of vitamin B₁₂?

A
Biotin

B
Cobalt

C
5,6-dimethyl Benzimidazole

D
Betaine

Solution

The yield of vitamin B₁₂ increases when the medium is supplemented with betaine. The usual source of betaine is sugar beet molasses.
Question 8
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Umami is a savory taste. Which of the following organism produce amino acids that are responsible for umami constituents of soy sauce?

A
Aspergillus acidus

B
Aspergillus fumigatus

C
Aspergillus sojae

D
Aspergillus niger

Solution

Aspergillus sojae is used in soy sauce preparation. It is responsible for umami constituents of soy sauce.
Question 9
1 / -0

For which of the following purposes is alpha-amylase, sourced from Bacillus licheniformis, used?

A
Ripening of fruits

B
Preparation of detergents

C
Banana juice preparation

D
Making digestion pills

Solution

α-amylase called "Termamyl", sourced from Bacillus licheniformis, is used in some detergents, especially dishwashing and starch-removing detergents.
Question 10
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In biotransformation used for production of riboflavin, glucose is converted into D-ribose in the first step of the procedure. Which of the following bacteria brings about this conversion?

A
Ashbya gossypii

B
Bacillus pumilus

C
Eremothecium ashbyii

D
Mycobacterium smegmatis

Solution

In Biotransformation, glucose is first converted into D-ribose by mutant strains of Bacillus pumilus. This D-ribose is converted into riboflavin by chemical reactions.

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Re-Attempt Weekly Quiz Competition

Microbes in Human Welfare Test - 4

Result

Microbes in Human Welfare Test - 4

Score

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SHARING IS CARING

Question 1

Aspergillus niger

Candida utilis

Kluveromyces fragilis

Saccharomyces cerevisiae

Solution

Question 2

Vitamin D

Aspartame

L- glutamate

Threonine

Solution

Question 3

Homoserine dehydrogenase

Threonine synthase

Aspartate semialdehyde dehydrogenase

Homoserine kinase

Solution

Question 4

Isopropanol

Glucose

Lactic acid

Penicillin

Solution

Question 5

L-valine

L-cysteine

L-methionine

L-isoleucine

Solution

Question 6

Lower ethanol tolerance

Can ferment xylulose and arabinose

High sugar uptake and ethanol yield

Can tolerate toxic inhibitors present in lignocellulosic hydrolysates

Solution

Question 7

Biotin

Cobalt

5,6-dimethyl Benzimidazole

Betaine

Solution

Question 8

Aspergillus acidus

Aspergillus fumigatus

Aspergillus sojae

Aspergillus niger

Solution

Question 9

Ripening of fruits

Preparation of detergents

Banana juice preparation

Making digestion pills

Solution

Question 10

Ashbya gossypii

Bacillus pumilus

Eremothecium ashbyii

Mycobacterium smegmatis

Solution

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