Which one is not a character of pBR322? (1) One pair of antibiotic resistance genes (2) Selectio...

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Which one is not a character of pBR322?
(1) One pair of antibiotic resistance genes
(2) Selection of recombinants from nonrecombinants is a two step process
(3) Identification of recombinants by insertional inactivation of lac \( Z \)
(4) Restrcition sites for Pst I and Pvu I are located within ampr gene while those for Bam HI and Sal I are located within tetr gene
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