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Microbes in Human Welfare
Microbes in Industrial Products
18 questions from 15 papers, each with its answer.
- questions
- 18
- papers
- 15
- years asked, 2017–2026
- 3 of 10
- of Microbes in Human Welfare
- 22.22%
Appears in
Concepts tested
- Microbes and their products 2
- Bioactive molecules
- Citric acid production
- clostridium-butyric-acid
- Clot buster
- Ethanol production
- Fermented beverages
- Industrial uses of enzymes
- Industrial uses of microbes
- Microbes in industrial products
- Microbial fermentation in curing
- microbial-products-match
- Organic acids
- Retting of fibres
- Statins
- Yeast fermentation to ethanol
- yeast-ethanol
All Questions
2026 Re-NEET 1 question
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Which of the following is used as a clot buster?Reference: NCERT Class XII, page 153.
2021 1 question
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Match List-I with List-II.
Pick the matching item from Column II for each row.
Column I
- A. Aspergillus niger
- B. Acetobacter aceti
- C. Clostridium butylicum
- D. Lactobacillus
Column II
- I. Acetic Acid
- II. Lactic Acid
- III. Citric Acid
- IV. Butyric acid
Correct answer: A → III, B → I, C → IV, D → II
2017 1 question
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Which of the following is correctly matched for the product produced by them?
$S.\ cerevisiae$ ferments sugars to ethanol.
$Saccharomyces\ cerevisiae$ is commonly called brewer's yeast. It causes fermentation of carbohydrates, producing ethanol.
2016 1 question
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Which of following is wrongly matched in the given table? (Microbe – Product – Application)
$C.\ butylicum$ gives butyric acid, not lipase.
$Clostridium\ butylicum$ produces butyric acid by fermentation; it does not produce lipase. Lipase is produced by $Candida\ albicans$.
2016 Phase II 1 question
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Match Column–I with Column–II and select the correct option using the codes given below
Pick the matching item from Column II for each row.
Column I
- a. Citric acid
- b. Cyclosporin A
- c. Statins
- d. Butyric acid
Column II
- i. $Trichoderma$
- ii. $Clostridium$
- iii. $Aspergillus$
- iv. $Monascus$
Correct answer: a → iii, b → i, c → iv, d → ii
2015 AIPMT-II 1 question
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Match the following list of microbes and their importance:
Pick the matching item from Column II for each row.
Column I
- a. Saccharomyces cerevisiae
- b. Monascus purpureus
- c. Trichoderma polysporum
- d. Propionibacterium sharmanii
Column II
- i. Production of immunosuppressive agents
- ii. Ripening of Swiss cheese
- iii. Commercial production of ethanol
- iv. Production of blood cholesterol lowering agents
Correct answer: a → iii, b → iv, c → i, d → ii
2013 NEET 1 question
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A good producer of citric acid is:Aspergillus niger (a fungus) is used for the commercial production of citric acid.
2012 AIPMT-PRE 2 questions
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A patient brought to a hospital with myocardial infarction is normally immediately givenMyocardial infarction is caused by a clot blocking a coronary blood vessel.
Streptokinase, produced by the bacterium Streptococcus and modified by genetic engineering, is used as a clot buster to remove the clot.
Statins lower blood cholesterol, penicillin is an antibiotic and cyclosporin-A is an immunosuppressant. -
Monascus purpureus is a yeast used commercially in the production ofStatins produced by the yeast Monascus purpureus are used as blood-cholesterol lowering agents.
They act by competitively inhibiting the enzyme responsible for the synthesis of cholesterol.
Ethanol comes from Saccharomyces, streptokinase from Streptococcus and citric acid from Aspergillus niger.
2011 AIPMT-MAINS 2 questions
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Read the following statement having two blanks (A and B).
"A drug used for ____(A)____ patients is obtained from a species of the organism ____(B)____."
The one correct option for the two blanks is:Cyclosporin A, which is used as an immunosuppressive agent in organ-transplant patients, is produced by the fungus $Trichoderma\ polysporum$. This pair is correct.
$Monascus\ purpureus$ (a yeast) produces statins, which are blood-cholesterol lowering agents, not a drug for swine flu.
$Penicillium$ gives the antibiotic penicillin; the 'clot buster' used for heart patients, streptokinase, comes from the bacterium $Streptococcus$.
No AIDS drug is obtained from $Pseudomonas$.
Hence the correct option is organ-transplant and $Trichoderma$. -
Which one of the following is a wrong matching of a microbe and its industrial product, while the remaining three are correct?$Clostridium\ butylicum$ (a bacterium) produces butyric acid; lactic acid is produced by $Lactobacillus$. So this match is wrong.
$Aspergillus\ niger$ (a fungus) produces citric acid – correct.
The yeast $Monascus\ purpureus$ produces statins, the blood-cholesterol lowering agents – correct.
$Acetobacter\ aceti$ (a bacterium) produces acetic acid – correct.
Hence the wrong matching is $Clostridium\ butylicum$ – lactic acid.
2011 AIPMT-PRE 2 questions
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Ethanol is commercially produced through a particular species ofThe yeast $Saccharomyces\ cerevisiae$ (brewer's yeast) is used for the commercial production of ethanol by fermentation of malted cereals and fruit juices.
$Aspergillus\ niger$ is used for producing citric acid.
$Clostridium\ butylicum$ is used for producing butyric acid.
$Trichoderma\ polysporum$ is the source of cyclosporin A, an immunosuppressive agent.
Hence ethanol is commercially produced through a species of $Saccharomyces$. -
The most common substrate used in distilleries for the production of ethanol isEthanol is produced by the fermentation of sugars by the yeast $Saccharomyces\ cerevisiae$.
Molasses is the thick, dark syrup left as a by-product of the sugar industry after the crystallisation of sugar from sugarcane juice.
It is rich in fermentable sugars (sucrose, glucose and fructose), is cheap and is available in large amounts, so it needs no prior conversion of starch into sugar.
Corn meal, soya meal and ground gram are rich in starch or protein and are costlier substrates.
Hence the most common substrate used in distilleries is molasses.
2009 AIPMT 1 question
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Which one of the following pairs is wrongly matched?Amylases are used in the textile industry to remove starch (desizing) – correct.
Lipases are used in detergent formulations and help in removing oily stains from laundry – correct.
Pectinases (and proteases) are used to clarify bottled fruit juices – correct.
Alcohol is produced by the fermentation of sugars by yeast, through enzymes such as zymase; nitrogenase is the enzyme of nitrogen fixation and has nothing to do with alcohol production.
Hence the wrongly matched pair is alcohol – nitrogenase.
2007 AIPMT-PRE 1 question
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Which one of the following pairs is wrongly matched?Vinegar (acetic acid) is produced by the acetic acid bacterium Acetobacter aceti, which oxidises ethanol to acetic acid.
Coliforms such as Escherichia coli are bacteria that live in the intestine of man and other warm-blooded animals. Their presence in drinking water indicates faecal contamination; they are not used for making vinegar.
So the pair coliforms - vinegar is wrongly matched.
Yeast (Saccharomyces cerevisiae) ferments sugars to produce ethanol.
Streptomycetes (species of Streptomyces) produce antibiotics such as streptomycin.
Methanogens (for example Methanobacterium) produce methane during the anaerobic breakdown of cattle dung, giving gobar gas (biogas).
These three pairs are correctly matched.
2006 AIPMT-PRE 1 question
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Curing of tea leaves is brought about by the activity of -Curing is the process by which the characteristic flavour, colour and aroma of products such as tea, tobacco and coffee are developed.
The leaves are allowed to ferment under controlled conditions.
In tea, this fermentation is brought about by the activity of bacteria, for example Micrococcus candidans, which act on the substances present in the leaves.
Tobacco leaves are similarly cured by Bacillus megatherium.
Mycorrhiza is a symbiotic association of fungi with roots and has no role in curing, and viruses do not carry out fermentation.
So the curing of tea leaves is brought about by the activity of bacteria.
2005 AIPMT 1 question
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For retting of jute the fermenting microbe used is -Retting is the process of separating the fibres of jute (and flax, hemp) from the stem.
The stems are submerged in water, where bacteria decompose the pectin of the middle lamella that binds the fibres to the surrounding tissues.
This fermentation is carried out by butyric acid bacteria such as Clostridium butyricum (and related Clostridium species).
After retting, the fibres can be easily separated by beating and washing.
Helicobacter pylori causes stomach ulcers, Streptococcus lactis is used in curdling milk, and methanogens produce methane.
So the microbes used for retting of jute are butyric acid bacteria.
2000 AIPMT 1 question
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Which of the following is used to manufacture ethanol from starch :Starch is first hydrolysed to sugars (by amylase or acid). The yeast Saccharomyces cerevisiae then ferments the sugar into ethanol and $CO_2$: $C_6H_{12}O_6 \rightarrow 2C_2H_5OH + 2CO_2$
Penicillium gives penicillin, Azotobacter fixes nitrogen and Lactobacillus produces lactic acid.
So Saccharomyces is used to manufacture ethanol from starch.