Question

please answer #4

U ue data collected by all classes in the table below Escherichia coli Serratia quiacions # of gradient plates inoculated Micrococcus luteus Bacillus subtils 16 #of plates with resistant colonies 3 of plates with resistant colonies. 33.33%. 18,75% 0% 43.751. (#plates with resistant colonies) X 100 # of plates inoculated 2. Did the different bacteria used in this lab all produce the same results 7 (circle your answer) 3. A bacterial colony represents all the progeny of a single cell. We refer to a colony as a clone, because bacteria reproduce asexually so all of the daughter cells should be genetically identical. However, some bacteria that were sensitive to the antibiotic at the beginning of the experiment were resistant by the end. What naturally occurring event led to resistance? (Hint: We are working with pure cultures of laboratory strains, so there are no superbugs around sharing their genes for resistance.) 4. Did the presence of streptomycin in the gradient plates cause the bacteria to generate new genes for resistance? (circle your answer) Yes No Why or why not?

Answer 1

Yes, the presence of streptomycin in the media induces resistance genes in the bacteria.

First of all, the bacteria population starts to decline in the media. With time there is found mutation in the genome which leads to generate the new genes. In this way, the resistance genes are generated in the population so that they can survive in the streptomycin containing media.