A) Drosophila melanogaster
B) Escherichia coli
C) Streptococcus pneumonia
D) Salmonella typhimurium
Correct Answer: B
Solution :
Semi-conservative replication of DNA was first demonstrated in E. coli. According to the semi- conservative mode proposed by Watson and Crick, each strand of the two double helices formed would have one old and one new strand. The semi-conservative nature of DNA replication was proved by the experiment of Meselson and Stahl (1958).
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