When a solution of cesium chloride (cscl) is subjected to high-speed centrifugation, a stable density gradient is formed. meselson and stahl found that when cell contents were subjected to centrifugation with a cscl 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. assign letters a-e to the pictures above. dna from e. coli cells grown in ^5n dna from e. coli cells grown in ^14 n a 1: 1 mixture of dna from cells grown in 14^n and cells grown in ^15 n a 1: 1 mixture of dna from cells grown in 14^n and 15^n, heated (to disrupt hydrogen bonds) and cooled (to allow reannealing) dna containing one strand of ^15 n-dna and one strand of ^14 n-dna
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Biology, 23.06.2019 00:20
How have crops been modified? a.plants have been made more susceptible to pests b.plants have been made resistant to herbicides c.plants have been made more susceptible to herbicides d.plants have been modified to have reduced yield
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When a solution of cesium chloride (cscl) is subjected to high-speed centrifugation, a stable densit...
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