Luria and Delbruck grew many liquid cultures of bacteria then spread a small sample of each culture on nutrient agar infused with bacteriophage in separate petri plates. They assayed the number of bacterial colonies that formed on each plate. -A researcher planned to duplicate the Luria Delbruck fluctuation experiment.This researcher inoculated twenty samples of liquid nutrient media with bacteria from the same colony and let them grow overnight.The next morning the researcher noticed that all but one of the flasks had come open and were ruined.Not wishing to redo the experiment, the researcher spread samples of bacteria from the one intact liquid culture on twenty petri plates that had nutrient agar infused with bacteriophage.What results do you expect the researcher obtained from this experiment?
A)All plates had some bacterial colonies; some plates had more bacterial colonies than others. B)Some plates had no bacterial colonies; others had varied numbers of colonies. C)All plates had a similar number of bacterial colonies. D)Some plates had no bacterial colonies; all of the other plates had a similar number of bacterial colonies. E)No bacterial colonies formed on any of the plates.
Luria and Delbruck grew many liquid cultures of bacteria then spread a small sample of each culture on nutrient agar infused with bacteriophage in separate petri plates. They assayed the number of bacterial colonies that formed on each plate. -In the Luria Delbruck experiment, what did the appearance of a bacterial colony on a petri plate indicate?
A)The bacterial colony was derived from one initial cell that was resistant to infection by the bacteriophage. B)The bacterial colony was made up of many cells that became resistant to bacteriophage infection independently. C)A colony formed when a bacterial cell was not resistant to bacteriophage infection. D)The bacterial cells that made up a colony were resistant to antibiotic.