Two bacteria most useful in genetic engineering are

Rhizobium and Azotobacter

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Escherichia and Agrobacterium

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Rhizobium and Diplococcus

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Nitrosomonas and Klebsiella

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Solution

The correct option is B Escherichia and Agrobacterium
Till today, the most important bacteria in genetic engineering of plants has been the Ti plasmid of soil bacterium, Agrobacterium tumefaciens and Escherichia coli. These have been extensively used as "work horse" for genetic engineering. For example, production of humulin, somatotropin.
So, option B is the correct option.

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