A) Escherichia coli and Agrobacterium tumefaciens
B) Vibrio choleras and a tailed bacteriophage
C) Diplococcus sp. and Pseudomonas sp.
D) Crown gall bacterium and Cacnorhabditis elegans
Correct Answer: A
Solution :
Escherichia coli and Agrobacterium tumefaciens are the microbes found to be very useful in genetic engineering. E. coli is a motile, gram negative, rod shaped bacterium which is a normal inhabitant of human colon. It is most extensively used in bacterial genetics and molecular biology. Agrobacterium tumefaciens is a soil bacterium. It has Ti plasmid (Tumour inducing plasmid) and it can be used for the transfer of a desired gene in dicot plants.
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