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