17. Mutation, Repair, and Recombination
Induced Mutations
Problem 28a
Textbook Question
Textbook QuestionIn an Ames test using his⁻ Salmonella bacteria a researcher determines that adding a test compound plus the S9 extract produces a large number of his⁺ revertants but mixing the strain plus the test compound without adding S9 does not produce an elevated number of his⁺ revertants. What is the reason for the different experimental results described?
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