In the Meselson Stahl experiment, E. coli was grown for many generations in a medium \"heavy\" nitrogen^15 N. Once the bacterial DNA was uniformly labeled, the bacteria were transferred to a medium containing the \"light\" nitrogen, ^14N. After ONE round of replication, DNA was extracted and subjected to density gradient centrifugation in cesium chloride. Upon inspection, there was only a single band of intermediate density DNA in the gradient. This proved that DNA replication CANNOT be conservative dispersive semiconservative conservative of dispersive continuous. Solution Answer is Dispersive replication. Dispersive replication would result in double-stranded DNA with both strands having mixtures of 15N and 14N DNA, either of which would have appeared as DNA of an intermediate density..