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Why is the catalase test useful for the differentiation of staphylococci from streptococci?
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- A conjugation-deficient strain of A. radiobacter is used to combat crown gall disease. Explain how this bacterium prevents the disease, and describe the advantage of using a conjugation-deficient strain.Why does RNA give a positive result to Biuret's test?What is the purpose of the S-9 in the Ames test?
- What is the purpose of conducting a modified Furter-Meyer Test? What is the principle behind this test? How could you identify the positive result for this test?Is the BSA a good stadard to use in the bradford assay?An E. coli colony grew on minimal medium supplemented with arginine and leucine. However, bacteria from this colony are unable to grow and form colonies on minimal medium supplemented with arginine and methionine. What is the genotype of the bacteria in this E. coli colony?
- In bacterial transformation, What is the purpose of ampicillin and arabinose in the growth media?What reaction would you expect when performing a positive control in the catalase assay? What would it mean if a known catalase-positive bacteria did not produce the expected reaction?Could you perform the Ames test with a strain of bacteria that was auxotrophic for something other than histidine? How would the setup and execution of the experiment change, and why? Note: keep it short , not too short please