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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