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Recombinant pBR322 colonies show which pattern on antibiotic plates?
AGrow on tetracycline only
BGrow on both antibiotics
CGrow on ampicillin only
DGrow on neither one
Answer & Solution
Correct answer: C. Grow on ampicillin only
Insertion inactivates tetR, so recombinants grow with ampicillin but not tetracycline, unlike non-recombinants.
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