Question

Which of the following scientists developed a method of removing the plasmids from the cell and then reinserting them in other cells?

• A. Herbert Boyer
• B. Stanley Cohen
• C. Both a and b
• D. Sir Alec Jeffreys

Answer 1

The correct option is B Stanley Cohen

Plasmids are small, autonomously replicating, extrachromosomal double-stranded circular DNA molecules found in certain bacteria. Stanley Cohen was a scientist from Stanford University. He had developed a method of removing the plasmids from the bacterial cells and then reinserting them in other cells.

Herbert Boyer from the University of California performed studies on a few restriction enzymes of the E. coli bacterium. He noticed that the restriction enzymes have the capability of cutting DNA at specific sites.

Stanley Cohen and Herbert Boyer generated the first recombinant DNA molecule by combining a gene (DNA) from a bacterium with a plasmid (DNA) of Escherichia coli.

Sir Alec Jeffreys developed a method of DNA fingerprinting. This method involves identifying a person based on certain repetitive sequences in the DNA.