A) Vibrio cholerae and a tailed bacteriophage
B) Diplococcus sp. and Pseudomonas sp.
C) Crown gall bacterium and Caenorhabditis elegans
D) Escherichia coil and Agrobacterium tumefaciens
Correct Answer: D
Solution :
Escherichia coli is a bacterium found in human colon. On this bacterium scientists have made extensive genetic experiments to make some vital chemicals like insulin. Another bacterium is Agrobacterium tumefaciens which causes crown gall in plants. It is extensively used for genetic experiments.
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