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The Thread of Life is deoxyribonucleic acid also known as DNA This molecule which is the bases of life is spiral shaped and found in the nucleus of cells DNA has the genetic code for bodies controls development of embryos and is able to repair damage caused to itself All DNA molecules have linked units called nucleotides These nucleotides have sub-units that have 5 carbon sugars that are called deoxyribose DNA is composed of four bases called adenine thymine guanine and cytosine These are some of the main principles of DNA What we know today about structure of DNA begins in 1868 when a Swiss biologist Friedrich Miescher did the first experiments on the nuclei of cells Miescher used the nuclei of pus cells from old medical bandages In these pus cells he found What We know today about structure of DNA begins in 1868 when a Swiss biologist Friedrich Miescher did the first experiments on the nuclei of cells Miescher used the nuclei of pus cells from old medical bandages In these pus cells he found phosphorus with a substance he called nuclein This nuclein has an acidic portion which is classified as DNA Another scientist Thomas Hunt Morgan made an important discovery around 1900 He observed that certain characteristics were inherited quickly through numerous generations of fruit flies So he made the conclusion that these genes must be near one another on the chromosome In 1943 Oswald Avery Colin MacLeod and Maclyn McCarty three scientists working in the Rockefeller institute preformed an experiment by taking DNA from a virulent disease-causing strain of Streptococcus pneumonae and transformed a non-virulent inactive form back to a virulent form Avery MacLeod and McCarty discovered from their experiments that DNA carried a virulent message that can be transferred into the recipient of non-virulent cells This proved that DNA was a carrier of genetic information An important discovery of the 1940s
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