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A:
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- Which process converts ammonium (NH4+ ) into nitrate (NO3− )?a) Nitrogen fixationb) Ammonificationc) Nitrificationd) Denitrificatione) AnammoxMicroaerophiles A) O do not require oxygen for growth B) O are the same as facultative anaerobes C) O have the same oxygen reguirements as aerotolerant anaerobes D) O completely lack enzymes protecting them from the damaging effects of oxygen. E O None of the above are correctDissimilatory nitrate reduction carried out by bacteria can lead to loss of nitrogen as N, from the environment. A) O True B) O False
- a) What is the consequence of discharging larger volumes of sewage that is untreated into a river? b) What is the significance of anaerobic sludge digestion in sewage treatment?Requires oxygen at a lower concentration than typically found in air. Question 3 options: a) Obligate aerobe b) Facultative anaerobe c) microaerophile d) None of the aboveThe autotrophic mode of nutrition requires:a) Chlorophyllb) Sunlightc) Carbon – dioxide & waterd) all of the above
- A sharp growth line in the SIM media is an indication of what characteristic? A) Hydrogen sulfide gas production B) Tryptophan breakdown C) Indole production D) Non-motileWhich of the following is often added to wine to inhibit growth of the natural microbial populations on grapes?a) Benzoic acid b) Lactic acid c) Carbon dioxided) Sulfur dioxide e) OxygenBasically, catalase tests is performed to confirm if an organism is an: A) Carbon dioxide producer B) H₂Oterminal electron acceptor C) Hydrogen peroxide detoxifier D) Oxygen producer E) Fermentative
- Which statement among A-C is not applicable to flocculation, or floc formation, during wastewater treatment? A) O Filamentous bacteria enhance floc formation. B) O Flocculation is important for the production of a clear effluent stream of wastewater. O O Flocculation decreases the amount of BOD entering the effluent stream of wastewater. D) OA-C are all applicable.Microorganisms are used in the production of a wide variety of fermented products. a) Using an example of a fermented product, explain the role of microorganisms in the production of this product. b) Explain why it is very important to control the quantity of food sources that these microbes metabolize?Microorganisms that require carbon dioxide for growth are called: * A)Psychrophiles B)Capnophiles C)halophiles D)Mesophiles