A) Diplococcus sp. and Pseudomonas sp.
B) Escherichia coli and Agrobacterium tumefaciens
C) Caenorhabditis elegance and crown gall bacterium
D) Trichoderma sp. and Aspergillus sp.
Correct Answer: B
Solution :
All bacteria have plasmids. These are extra nuclear DNA found in them. The Agrobacterium tumefacience and E. coli are most widely used bacterial organisms, whose plasmids are used as vectors in genetic engineering techniques.
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