Question

Microbes found to be very useful in genetic engineering are

• A. Escherichia coli and Agrobacterium tumefaciens
• B. Vibrio cholerae and a tailed bacteriophage
• C. Diplococcus sp. and Pseudomonas sp.
• D. Crown gall bacterium and Caenorhabditis elegans

Answer 1

The correct option is A Escherichia coli and Agrobacterium tumefaciens

Escherichia coli and Agrobacterium tumefaciens are microbes found to be very useful in genetic engineering.
E.coli is a mobile, Gram-negative, rod-shaped bacterium which is a normal inhabitant of the human colon. It is most extensively used in bacterial genetics and molecular biology.
Agrobacterium tumefaciens is a soil bacterium. It has $T_i$ plasmid (Tumour inducing plasmid) and it can be used for the transfer of the desired gene in dicot plants.