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Read the following statements and choose the correct option: 1. 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 2. The cutting of DNA at specific locations became possible with the discovery of the so-called ‘molecular scissors’– DNA liga

Options

  1. AOnly 4 is correct
  2. BBoth 1 and 2 are correct
  3. CBoth 2 and 3 are incorrect
  4. DOnly 2 is incorrect

Correct answer

C. Both 2 and 3 are incorrect

Step-by-step 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. Stanley Cohen and Herbert Boyer accomplished this in 1972 by isolating the antibiotic resistance gene by cutting out a piece of DNA from a plasmid which was responsible for conferring antibiotic resistance.

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