A sterile agar plate, I, is streaked with a pure culture of bacteria by means of aseptic techniques. Paper discs treated with the antibiotics Aureomycin (A) and penicillin (P) are placed at opposite sides of the plate, as shown in the diagram above. The plate is examined after a 24-hour incubation period, and a clear ring is discovered around disc A, but not around disc P. Within the clear ring around disc A, a single bacterial colony with physical characteristics like those of the pure culture is observed. A second sterile agar plate, II, is then streaked with this single colony and also incubated with antibiotics.

contaminated the agar platecontaminated the agar platecontained information conferring resistance to Aureo-mycincontained information conferring resistance to Aureo-mycinchanged its response to Aureomycin as a result of being exposed to the antibioticchanged its response to Aureomycin as a result of being exposed to the antibioticwas susceptible to both penicillin and Aureomycinwas susceptible to both penicillin and Aureomycinemigrated from another area of the agar plate

In the __________, paper disks impregnated with antibiotics are added to a solid medium inoculated with a standard amount of a pure bacterial culture to test whether the organism is sensitive, intermediate, or resistant to the drug.ANSWERantimicrobial response testbroth dilution testE-testKirby-Bauer test

Resistant and nonresistant E. coli bacteria samples were spread on the agar plates below and incubated for 24 hours.  The streptomycin negative with resistant E. coli. appears spread throughout the plate.The streptomycin positive with resistant E. coli. appears spread throughout the plate.The streptomycin negative with non-resistant E. coli. appears spread throughout the plate.The streptomycin positive with non-resistant E. coli. appears concentrated at three points on the plate. Select the true statements from the list below.Check All That ApplyThe resistant E. coli strain grows on streptomycin negative plates.The resistant E. coli strain grows on streptomycin negative plates.The nonresistant E. coli strain grows on streptomycin negative plates.The nonresistant E. coli strain grows on streptomycin negative plates.The nonresistant E. coli strain grows the same on streptomycin positive or negative plates.The nonresistant E. coli strain grows the same on streptomycin positive or negative plates.The resistant E. coli strain grows on streptomycin positive plates.The resistant E. coli strain grows on streptomycin positive plates.Both resistant and nonresistant E. coli strain show no growth on streptomycin positive plates.

Select the most appropriate reason for why clear areas have appeared around the paper discs.These are areas where the bacteria have killed each other.These are areas where the agar has not set properly.These are areas where the antimicrobial has killed the bacteria or stopped them growing.These are areas of agar that were not inoculated with bacteria.

Which of the following is a description of the elevation of a bacterial colony above the surface of an agar plate? Group of answer choices Filamentous Irregular Round Convex Rhizoid