A) Karry Mullis (1983)
B) E. Southern (1980)
C) Francis Collins (1985)
D) James D. Watson (1953)
Correct Answer: A
Solution :
Karry Mullis (1983) discovered polymerase chain reaction, which is widely exploited in gene cloning for genetic engineering. He made use of a thermostable enzyme Taq DNA polymerase (acts as \[{{72}^{o}}C\]) isolated from Thermus aquaticus. E.M. Southern (1975) developed a method called, Southern blotting technique for analysing the related genes in a DNA restriction fragment. James D. Watson and F.H.C Crick (1953) proposed a model for DNA comprising of two helically intertwined chains tied together by hydrogen bonds between purines and pyrimidines.
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