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Answer :
The correct method to select and grow a resistant strain of E. coli in this experiment is expose a sample of E. coli to streptomycin by inoculating it onto a streptomycin positive plate. Therefore option 1 is correct.
Any colonies that grow will carry a mutation for resistance. In this method, the E. coli bacteria are exposed to streptomycin on a plate with the antibiotic.
Any colonies that grow on this plate have developed resistance to streptomycin, indicating the presence of a mutation that confers antibiotic resistance.
This approach specifically selects for resistant strains, making it a targeted and effective way to isolate and grow these strains for further study or experimentation.
Therefore option 1 is correct.
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