Friedrich Miescher Watson and Crick
The Discovery of DNA's Structure. Taken in 1952, this image is the first X-ray picture of DNA, which led to the discovery of its molecular structure by Watson and Crick. Created by Rosalind Franklin using a technique called X-ray crystallography, it revealed the helical shape of the DNA molecul Water's composition (two parts hydrogen to one part oxygen) was discovered by the London scientist Henry Cavendish (1731-1810) in about 1781. Confidence votes 4.8K. At the time in which he lived, the word 'molecule' was used for all basic particles of matter, including atoms. The Italian, Amadeo Avogadro believed that there were three different types of molecule including 'elementary molecules' (atoms). First isolated by Friedrich Miescher in 1869 and with its molecular structure first identified by James Watson and Francis Crick in 1953, DNA is used by researchers as a molecular tool to explore physical laws and theories, such as the ergodic theorem and the theory of elasticity. Deoxyribonucleic acid (/diˌɒksiˌraɪbɵ.njuːˌkleɪ.ɨk ˈaesɪd/ ; ˈæSɪD) dna is a molecule that carries most of the genetic instructions used in the, development functioning and reproduction of all known living organisms and many. viruses A molecule may be homonuclear, that is, it consists of atoms of a single chemical element, as with oxygen (O 2); or it may be heteronuclear, a chemical compound composed of more than one element, as with water (H 2 O).  The First Discovery of DNA. Few remember the man who discovered the molecule of life three-quarters of a century before Watson and Crick revealed its structure. Ralf Dahm. Most everybody knows that DNA contains the blueprint for life. The names of Watson and Crick, the first scientists to figure out the structure of DNA in the 1950s, are also widely recognized. But left obscure in history is the name of the chemist who first isolated the DNA molecule itself. Confidence votes 21. Water's composition (two parts hydrogen to one part oxygen) was discovered by the London scientist Henry Cavendish (1731-1810) in about 1781. He reported his findings in terms of phlogiston (later the gas he made was proven to be hydrogen) and dephlogisticated air (later this was proven to be oxygen).  ribosome. The ribosome is a complex molecule made of ribosomal RNA molecules and proteins that form a factory for protein synthesis in cells. In 1955, George E. Palade discovered ribosomes and described them as small particles in the cytoplasm that preferentially associated with the endoplasmic reticulum membrane.  Many people believe that American biologist James Watson and English physicist Francis Crick discovered DNA in the 1950s. In reality, this is not the case. Rather, DNA was first identified in the late 1860s by Swiss chemist Friedrich Miescher. Chargaff's realization that A = T and C = G, combined with some crucially important X-ray crystallography work by English researchers Rosalind Franklin and Maurice Wilkins, contributed to Watson and Crick's derivation of the three-dimensional, double-helical model for the structure of DNA.
http://www.pbs.org/wgbh/evolution/library/06/3/l_063_01.html http://www.answers.com/Q/Who_discovered_molecules https://en.wikipedia.org/wiki/DNA https://en.wikipedia.org/wiki/Molecule http://www.americanscientist.org/issues/feature/2008/4/the-first-discovery-of-dna http://www.answers.com/Q/Who_discovered_the_water_molecule http://www.nature.com/scitable/definition/ribosome-194 http://www.nature.com/scitable/topicpage/discovery-of-dna-structure-and-function-watson-397
who discovered the molecule