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Answer to Question #61233 in Biochemistry for Sophie Wilkinson

Question #61233
Antibiotics being used as a selective marker. (ampicillin and tetracycline)
After the steps taken to distinguish between successful and failed insertion with ampicillin, B-galactosidase is a secondary test. I'm struggling to understand this section before tetracycline is introduced in the media. Thankyou!
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