Dna Replication Essay

1081 WordsJun 5, 20145 Pages
DNA Replication Semiconservative replication portrays the technique by which DNA is replicated in all known cells. There were three theories of replication planned by Watson and Crick, but the semiconservative replication was demonstrative by Meselson and Stahl. The first one was that semiconservative replication would create two copies that every one of them will contained one of the original strands and one new strand. Second, conservative replication would depart two original template DNA strands jointly in a double helix and would create a replica composed of two new strands including all of the new DNA base pairs. Third, dispersive replication would create two replicas of DNA, together containing different region of DNA composed of each original strands. These three theories were proposed by Watson and Crick. Together with, Meselson and Stahl showed that DNA replication was semiconservative. Their experimental was to grow E. coli bacteria, cultivated for several generations in a medium with a heavy isotope of nitrogen 15N. After that, they transferred E. coli into a new medium with a lighter isotope of nitrogen 14N. Then after one replication, they found that DNA was all of intermediate density. So this lead that conservative replication, predicts that both heavy DNA and light density DNA was presented. However, none of them were presented. This is why they say is semiconservative replication. DNA replication occurs during the synthesis of cell cycle phase S of the interphase, and is semiconservative because the two strands nucleotides that form the double helix of DNA is preserved and used as template for the synthesis of two complementary strands. Therefore, replication results in two DNA molecules in which each strand is retained and the other is new strand. ("Meselson, Matthew Stanley) The DNA replicates in a semiconservative way. This means that each

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