For decades, scientists have been unsure how a cell replicates its DNA. 3 competing theories were proposed. The first principle, known as the conservative version, posited that the original DNA double helix remained absolutely intact, and the brand new copy did not borrow any molecules from the original. The semiconservative version advised that DNA be unwound for the duration of replication, with every strand serving as a template for brand spanking new synthesis. Subsequently, in the dispersive version, the unique double helix changed into believed to be broken into many small pieces, with some of these portions finishing up within each new strand.The debate was eventually resolved in 1958 via  scientists named Matthew and Franklin Stahl. In a now-well-known biology experiment, they grew microorganisms inside a unique technique to label all the cells' DNA with a marker. They then used an exceptional marker to label only the DNA that became newly-synthesized. They observed that replicated DNA always contained one strand from the unique DNA molecule and one strand that was newly fashioned. This proved that the semiconservative version of DNA replication became accurate.