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B
Ori minus pBR 322
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C
DNA of Salmonella typhimurium
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D
Ti plasmid
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Solution
The correct option is A Ti plasmid A cloning vector is a small piece of DNA that can be stably maintained in an organism, and into which a foreign DNA fragment can be inserted for cloning purposes. The cloning vector may be DNA was taken from a virus, the cell of a higher organism, or it may be the plasmid of a bacterium.