A) Meselon and Stahl in 1998
B) Jacob and Monod in 1961
C) Watson and Crick in 1951
D) None of the above
Correct Answer: B
Solution :
Two French scientists Jacob and Monod (1961) proposed an operon model for regulation of gene activity in prokaryotes. Operon is a part of genetic material (or DNA) which acts as a single regulated unit having one or more structural genes, an operator gene, a promotor gene, a regulator gene, a repressor and an inducer or corepressor.
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