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Q.

The vector used in the first successful recombination DNA was from

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a

a bacteria that causes pneumonia.

b

a bacteria that can be detected by WIDAL test.

c

a fungus that produces citric acid.

d

a bacteria against which the first antibiotic was discovered.

answer is C.

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Detailed Solution

The construction of the first recombinant DNA emerged from the possibility of linking a gene encoding antibiotic resistance with a native plasmid (autonomously replicating circular extra-chromosomal DNA) of Salmonella typhimurium.Salmonella typhi is a pathogenic bacterium which causes typhoid fever in human beings. Typhoid fever could be confirmed by Widal test.

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