NEET 2009 Biology question

Semiconservative replication of DNA was first demonstrated in:

(1)Escherichia coliCorrect
(2)Streptococcus pneumoniae
(3)Salmonella typhimurium
(4)Drosophila melanogaster

Answer: (1)

Solution

Meselson and Stahl (1958) used -labelled *E. coli* grown in medium and separated DNA by CsCl density gradient centrifugation to show that DNA replication is semiconservative. *Streptococcus

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Question ID VK-090233