(Answered) In a famous experiment matthew meselson and franklin stahl

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In a famous experiment, Matthew Meselson and Franklin Stahl grew E. coli cells in a medium containing only the "heavy" isotope of nitrogen, ¹⁵N. These cells were then transferred to a medium with the "light" isotope of nitrogen, ¹⁴N. The results of the experiment supported the hypothesis of semiconservative replication, which was proposed by Watson and Crick.

a) Heavy DNA (¹⁵N DNA), hybrid DNA, and light DNA (¹⁴N DNA) can be separated by centrifugation. If cells containing ¹⁵N DNA are transferred to a medium with only ¹⁴N NH₄CI as a nitrogen source, what percent of daughter molecules are composed of hybrid DNA after 3 generations?

b) Predict what percent of daughter molecules would be composed of hybrid DNA if DNA exhibited conservative replication -that is, if a daughter DNA molecule were composed of newly synthesized DNA only.

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