Genetics and cellular FunctionDNA ana RNA - The nucleic AaasJonann Friedrich miescher (1844-95)Swiss biochemist, studied the nuclei of white bloodCells from pus extracted from bandages- coined term nuclein, now called deox riponucleic acid(DWA), repository for genesBy 1900, components of DNA were known (sugar, phosphoregroups, nitrogenous bases )in 1953 The overall Structure or DNA was learnedDNA Structure and FunctionDeoxyribonucleic acid (DNA)-long, thread - like molecuewith uniform alameter, but varied length46 DNA molecules (chromosomes) in nucleus of mosthuman ceusAverage human DNA molecule about a inches longDNA and other nuclic a cias are polymers ornucleotiaes-nuckotide consist of a sugar, phosphate group andnitrogenous baseA single nucleotide- one sugar - deoxy ribose- one phos phate group-one nitrogenous basePurines - Single ring- Cytosine- MhyminePyrimiaines - single ring- Cytosine (c)-Thymine (T)- uraal (u)DNA bases: A, T,C, GDouble helix shape of DNA (resembles spiralSt air case)