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- 1. Which of the following micro-organisms are the most resistant to heat sterilization? a. Vegetative bacteria (e.g., Samonella spp.) b. Spore-forming mesophilic bacteria (e.g., Clostridium botulinum) c. Spore-forming thermophilic bacteria (e.g., Bacillus stearothermophilus) d. Toxicogenic bacteria (e.g., E. coli O157:H7) e. All of the above are equally resistant to heat sterilization.1. are organic proteins which can speed up the biochemical reaction that occurs mainly outside or on the microbial cell surface. 2. Clean surface waters are normally saturated with . , which can be removed rabidly in the aerobic oxidation. 3. . and .. are the most importance two measures in water quality required to stabilize the wastewater. 4. The . process are responsible to limits the polluting discharge effect and the recovery time in rivers.2. a. explain 5 methods of nutrient uptake by cells b. explain the problems that may arise in the process of media sterilization using heat
- The mechanical removal of microbes from a limited area of living tissue is referred to as -- a. None of the above b. disinfection c. pasteurization d. antisepsis e. sterilizationSecondary metabolites of microbes are formed during thephase of growth.a. exponential b. stationary c. lag d. death5. With the aid of flow charts and / or equations, answer the following: a) Anoxic sludge digestion is a secondary waste water treatment; what are the major microbial processes occurring during this process? b) Explain how primary waste water treatment is carried out.
- 1. Explain the regulation of microbial growth by turgor pressure.Which type(s) of organism/s does not produce enzymes needed to breakdown toxic forms of oxygen? Select all that apply. a. Obligate aerobes b. Facultative anaerobes Oc. Microaerophiles Od. Aerotolerant anaerobes De. Obligate anaerobesAccording to the Liebig's Law of Minimum, which condition of certain growth factor limits growth of microorganisms? * A. factor in abundance B. factor in optimal C. factor in minimum D. factor in maximum 2. Growth is best when microbes are incubated at ______ level within its tolerance range. * A. minimum B. maximum C. optimum D. magnanimous 3. At what phase of microbial growth when microbial growth and reproduction is fastest? * A. death phase B. log phase C. lag phase D. stationary phase 4. Most human pathogens are ______ with regard to temperature range of tolerance for optimum growth. * A. thermophiles B. mesophiles C. psychrophiles D. xerophiles 5. Which adaptations are developed by thermophiles to withstand extremely high temperature? Check all that apply. * ( ) high proportion of unsaturated fatty acids in the cell membrane ( ) high cytosine-guanine nitrogenous bases ( ) more saturated fatty acids in cytoplasmic membrane ( ) heat-stable enzymes
- Which of following statements is TRUE about antiseptics and disinfectants? A. Disc diffusion works because the disc is soaked in bacteria and is the exposed to antimicrobial. B. You can tell the characteristics of the zone inhibition whether an organism is cidal or static in its effect. C.The shape of an object being cleaned may influence the effectiveness of germicides D. Gram + organisms are more resistant than Gram - organisms E. A large zone of inhibition shows bactericidal effect1. Which of the following statements about agar is NOT true? A. It is derived from algae. B. it is typically utilized by bacteria. C. It is solid at room temperature. D. It is the defining ingredient between liquid and solid versions of the same media.Agar is added to media. a. many kinds of bacterial O b. All kinds.of viral no kinds of microbial O d. All kinds of microbial