Which of the following is not true about pBR322 vector?
- AIt was constructed by using DNA derived from naturally occuring plasmids of E. coli
- BIt has two drug resistance genes, tetR and ampR
- CIt was developed by Bolivar and Rodriguez
- DSelectable markers present in it can differentiate recombinants from non- recombinants on the basis of their inability to produce colour in the presence of chromogenic substrate
✓ Correct answer: D
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