Question

All the following statements about Stanley Cohen and Herbert Boyer are correct, except

• A. They discovered recombinant DNA (rDNA) technology and this marks the birth of modern biotechnology.
• B. They produced first healthy cloned sheep, Dolly, from the differentiated adult mammary cells.
• C. They invented genetic engineering by combining a piece of foreign DNA containing a gene from a bacterium with a bacterial (E. coli) plasmid using the enzyme restriction endonuclease.
• D. They isolated the antibiotic resistance gene by cutting out a piece of DNA from a plasmid which was responsible for conferring antibiotic resistance

Answer 1

Answer: (B)

Stanley Cohen and Herbert Boyer did not produce Dolly, from the differentiated adult mammary cells.
Dolly (5 July 1996 - 14 February 2003) was the first mammal to be cloned from an adult somatic cell, using the process of nuclear transfer. She was cloned by Ian Wilmut, Keith Campbell, and colleagues at the Roslin Institute. The cell used as the donor for the cloning of Dolly was taken from a mammary gland, and the production of a healthy clone, therefore, proved that a cell taken from a specific part of the body could recreate a whole individual.