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Which bacterium's Ti plasmid is modified as a plant cloning vector?

AThermus aquaticus strain
BBacillus thuringiensis
CSalmonella typhimurium
DAgrobacterium tumifaciens
Answer & Solution
Correct answer: D. Agrobacterium tumifaciens
Agrobacterium tumifaciens delivers T-DNA to dicot plants, and its disarmed Ti plasmid carries desired genes.
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