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Biology · MICROBES IN HUMAN WELFARE
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Biology · MICROBES IN HUMAN WELFARE
Which bioactive molecule is commercially used as an immunosuppressive agent in organ-transplant patients?
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Which microbial enzyme is used in detergent formulations and is helpful in removing oily stains from laundry?
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Consider the following statements regarding secondary sewage treatment and sludge processing: (A) The effluent is passed into aeration tanks where growth of aerobic microbes forms flocs. (B) The BOD of sewage is significantly reduced during the aeration tank process. (C) A small part of the activated sludge is pumped back into the aeration tank to serve as inoculum. (D) Anaerobic sludge digesters produce gases such as methane, hydrogen sulphide and carbon dioxide. How many of the above statements are correct?
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During secondary treatment of sewage, flocs are formed by:
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Consider the following statements about microbes and their characteristics: (A) Microbes include protozoa, bacteria, fungi and microscopic animal and plant viruses, viroids and prions. (B) Microbes like bacteria and fungi can be grown on nutritive media to form colonies that can be seen with the naked eyes. (C) Prions are proteinaceous infectious agents. (D) All microbes are pathogenic and cause harmful diseases in human beings. Which of the above statements are correct?
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Match List-I with List-II: List-I List-II A Ladybird I Controls butterfly caterpillars B Bacillus thuringiensis II Controls aphids C Dragonfly III Fixes nitrogen in paddy fields D Anabaena IV Controls mosquitoes Choose the correct answer from the options given below:
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Among the following alcoholic beverages, which one is produced without distillation?
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Match List-I with List-II: List-I List-II A Primary treatment I Microbial digestion in anaerobic sludge digesters B Flocs II Physical removal of particles through filtration and sedimentation C Activated sludge III Masses of bacteria associated with fungal filaments D Biogas production IV Sediment formed after secondary treatment aeration Choose the correct answer from the options given below:
Read answer →Biology · MICROBES IN HUMAN WELFARE
The large holes observed in 'Swiss cheese' are attributed to the production of a large amount of \( \text{CO}_2 \) by which of the following organisms?
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With reference to following Figure (A typical biogas plant), which labeled component represents the floating cover placed over the slurry that keeps rising as gas is produced?
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Given below are two statements: Statement I: Bacillus thuringiensis spores are mixed with water and sprayed onto vulnerable plants like brassicas and fruit trees to kill insect larvae. Statement II: The bacterial spores themselves directly dissolve the plant vascular tissues to induce systemic immunity against pests. In the light of the above statements, choose the most appropriate answer from the options given below:
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Which yeast, commonly called brewer's yeast, is used for fermenting malted cereals and fruit juices to produce ethanol?
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Primary treatment of sewage mainly involves the physical removal of particles—large and small—from the sewage through filtration and sedimentation. Reason (R): Secondary treatment of sewage relies heavily on the growth of aerobic microbes into flocs that consume organic matter and reduce BOD. In the light of the above statements, choose the correct answer from the options given below:
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Which of the following pairs correctly matches the microbial biocontrol agent with its respective target pest or disease?
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Given below are two statements: Statement I: Microbes are diverse and include protozoa, bacteria, fungi, microscopic animal and plant viruses, viroids, and prions. Statement II: Prions are infectious agents made up of active DNA molecules enclosed in a protein coat. In the light of the above statements, choose the most appropriate answer from the options given below:
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What is the primary ecological advantage of using baculoviruses of the genus Nucleopolyhedrovirus as biological control agents?
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Which of the following microorganisms is correctly matched with its commercial or industrial product?
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Match List-I with List-II: List-I List-II A Lipases I Clot buster from blood vessels B Pectinases II Removal of oily stains from laundry C Streptokinase III Immunosuppressive agent D Cyclosporin A IV Clarification of bottled juices Choose the correct answer from the options given below:
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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Streptokinase produced by the bacterium Streptococcus is modified by genetic engineering and used as a 'clot buster' for removing clots from blood vessels. Reason (R): Streptokinase dissolves blood clots by accelerating the conversion of fibrinogen directly into red blood cells. In the light of the above statements, choose the correct answer from the options given below:
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Penicillin was discovered by Alexander Fleming while working on which of the following bacteria?
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Match List-I with List-II: List-I List-II A Propionibacterium sharmanii I Citric acid production B Trichoderma polysporum II Swiss cheese holes C Monascus purpureus III Cyclosporin A D Aspergillus niger IV Blood-cholesterol lowering agent Choose the correct answer from the options given below:
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Statins, which are commercialized as blood-cholesterol lowering agents, are produced by:
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