When solution of cesium chloride (CsCI) is subjected to high speed centrifugation, stable density gradient is formed. Meselson and Stahl found that when cell contents were subjected to centrifugation with a CsCI solution; a band of DNA formed at the CsCl density that matched the density of the DNA_ This technique is called density-gradient centrifugation: The test tubes below show the results of density-gradient centrifugation of five different DNA samples tuDC tubc tuoc test tubc tcsttubt Assign letters a-e t0 the pictures above. 2 pts DNA from E. coli cells grown in "SN b. DNA from E. coli cells grown in IN A I:1 mixture of DNA from cells grown in "N and cells grown in ISN d.A I:1 mixture of DNA from cells grown in 'N and 'SN, heated (to disrupt hydrogen bonds) and cooled (to allow reannealing) DNA containing one strand of ISN-DNA and one strand of HN-DNA