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18. Pseudomonas aeruginosa, a strict aerobic gram negative bacilli that is often cause of nosocomial infections in respiratory patients, is best characterized by the following: A) absence of growth on MacConkey's agar B) growth only at the top of the media interface in thioglycollate media C) retains the crystal violet iodine complex after decolorization D) all of the above E) none of the above = identify 19. A rapid procedure for determining the degree of sensitivity or resistance to a number of antibiotics on an agar plate is known as the A) Ames's test B) minimum inhibitory concentration (MIC) test C) the Kirby Bauer test C) broth dilution test E) none of the above = identify 20. When animals and humans are subjected to drugs and antibiotics over long periods of time, the bacteria which may be associated with infections may acquire A) selective toxicity B) broad spectrum antibiotic susceptibility C) multiple resistant genes D) all of the above E) none of the above = identify 21. An exotoxin produced by a gram positive spore forming bacteria, which may be normally found in the soil, is best associated with the following A) flaccid paralysis B) rice water stools C) presence of IGA D) all of the above E) none of the above = identify 22. Rhizobium sp., a symbiont within the root nodules cells of legumes, is a gram negative aerobic rod that function in nitrogen fixation, is characterized by A) high teichoic acids presence in the cell wall B) formation of resist spores C) loses the crystal violet complex with decolorization D) stains with the counter stain potassium iodide reagent E) none of the above identify 23. Desulfovibnrio and Desulfuromonas are gram negative Bactria that are important because of their role in the anaerobic corrosion of iron in pipelines and heating systems. The following would be expected A) production of black precipitate with SIM media B) forms a complex with iodine and acetone alcohol C) stains with the primary stain safranin after decolorization D) all of the above E) none of the above identify complex after