Question

meselson and stahl carried out centrifugation in cscl2 density gradient to separate the normal DNA from 15N-DNA
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Answer 1

Model of Meselson and Stahl

Explanation:

• There were three models for how living beings might exchange their DNA such as semi-conservative, conservative and dispersive  
• The semi-conservative model, in which each strand of DNA provides as a template to make another, correlative strand, appeared to be no doubt dependent on DNA's structure
• The models were tried by Meselson and Stahl, who marked the DNA of microbes across the generations utilizing isotopes of nitrogen
• Some examples of DNA marking they saw, Meselson and Stahl confirmed that DNA is replicated semi-conservatively