A) Escherichia coli
B) Bacillus thuringiensis
C) Staphylococcus aureus
D) Agrobacterium tumefaciens
Correct Answer: D
Solution :
Plant cells do not have endogeneous plasmids. The plasmid vectors used for plant cell transformation are mostly based on Agrobacterium tumefaciens (Ti-plasmid). These are plant pathogenic Gram\[\text{ve}\]soil bacteria, which cause crown gall disease of dicot plants.
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