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