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- which of the following definitions is not technically correct? a. broad spectrum - effective against many different types of microbes b. bacteriostatic - prevents microbes from growing c. antibiotic - microbial or synthetic product that kills or inhibits growth of microbes. d. all of the above are correct1. “Coliform bacteria are the only group of micro-organisms considered suitable for themonitoring of faecal pollution.”Is the statement above still valid? Motivate your answer and briefly describe at two othertypes of indicator organisms. 2.Microorganism growth in complex natural environments such as soils and waters can beutilized to carry out environmental management processes.3.1 Give one term for the process you would use to cleanse a marine oil spill and discussat least 3 types thereof.
- Choose the combination of answers that most accurately completes the statement.Microbe(s) that is/are the target(s) of pasteurization include(s) a. Clostridium botulinum c. Salmonella species b. Mycobacterium species d. both b and cIdentify the process orenvironment in this list that is notaffected by microorganisms.a. oxygen cyclesb. global temperaturesc. human healthd. all of the above have microbialinvolvementWhich of the following is not part of Koch’s Postulates? a. A specific microorganism must be present in a disease b. The organism must be isolated into pure culture c. Living organisms spring forth from non-living materials d. All of the choices are part of Koch’s Postulates
- Which of the following would be used to identify an unknown bacterialculture in your nursing school laboratory exercise?a. Gray’s Anatomyb. Bergey’s Manual of Systematic Bacteriology c. The Physicians’ Desk Referenced. Bergey’s Manual of Determinative BacteriologyWhich of the following affects the elimination of bacteriafrom an object?(a) Number of bacteria present(b) Temperature(c) pH(d) Presence of organic matter(e) All of the aboveWhich of the following microorganisms are not derivedfrom human pollution but can be found in water supply systemsand are considered “nuisance” organisms?(a) Coliform bacteria (d) Thiobacillus(b) Rhizobium (e) Clostridium(c) Azotobacter
- What is the difference in microbial population from water sediment and neustonic source? A. Ratio of phototrophic and heterotrophic microbes. B. Ratio of anaerobic microbes to aerobic microbes. C. Ratio of heterotrophic and cellulolytic microbes. D. All statements are acceptable descriptions.Which of the following would you expect if you let surfaces stay wet for 5 minutes instead of 10 minutes? A A smaller percentage of the microbes would be killed. B Time does not play a role in how successful a disinfectant treatment is, so a 5 minute application will kill the same percent of the total population as a 10 minute application. C The germicide would remove just as many total microbes; 10 minutes is definitely more time than is necessary.Answer the following questions: 1.How does adding salt or sugar preserve food? 2.Explain why microbiologists need to obtain synchronous cultures.