While constructing the first recombinant DNA molecule, Stanley Cohen and Herbert Boyer isolated plasmid from a while b acted as the host for the recombinant DNA.
Select the option which fill the blanks correctly.
a b
1) Escherichia
coli Salmonella
typhimurium
2) Salmonella
typhimurium Escherichia coli
3) Haemophilus
influenzae Agrobacterium
tumefaciens
4) Agrobacterium
tumefaciens Haemophilus
influenzae

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answer is B.

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Detailed Solution

While constructing the first recombinant DNA molecule, Stanley Cohen and Herbert Boyer isolated plasmid from Salmonella typhimurium while E.coli acted as the host for the recombinant DNA.

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	a	b
1)	Escherichia coli	Salmonella typhimurium
2)	Salmonella typhimurium	Escherichia coli
3)	Haemophilus influenzae	Agrobacterium tumefaciens
4)	Agrobacterium tumefaciens	Haemophilus influenzae