A tumour including plasmid widely used in the production of transgenic plants is that of
A
Escherichia coli.
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B
Bacillus thuringiensis.
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C
Staphylococcus aureus.
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D
Agrobacterium tumefaciens.
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Solution
The correct option is DAgrobacterium tumefaciens. Agrobacterium tumefaciens is the causative agent of crown gall disease, a form of tumor and is a gram-negative, rod-shaped bacteria. The symptoms of the disease are caused by the insertion of a small segment of DNA (known as the T-DNA, for 'transfer DNA'), from a plasmid, into the plant cell, which is incorporated at a semi-random location into the plant genome. This site can be used for the insertion of the desired gene into the plant genome, after making the plasmid non-pathogenic.