Question

Plasmid used to construct the first recombinant $DNA$ was isolated from which bacterium species?

• A. Escherichia coli
• B. Salmonella typhimurium
• C. Agrobacterium tumefaciens
• D. Thermus aquaticus

Answer 1

Answer: (B)

Salmonella typhimurium

Answer 2

The first recombinant $DNA$ was constructed by Stanley Cohen and Herbert Boyer in $1972$. They cut the piece of $DNA$ from a plasmid carrying antibiotic resistance gene in the bacterium Salmonella typhimurium and linked it to the plasmid of Escherichia coli.