DNA Strucure

- James Watson and Francis Crick worked out the structure of DNA in 1953. By using data from other scientists they were able to build a model of DNA. The X-ray crystallography data they used showed that DNA consists of two strands coiled into a double helix - DNA is a polymer made from four different nucleotides. These repeat. Each nucleotide consists of alternating sugar and phosphate sections with one of the four different bases attached to the sugar BASE PAIRS(Each strand of DNA is made of chemicals called bases): - thymine, T - adenine, A - guanine, G - cytosine, C There are chemical cross-links between the two strands in DNA, formed by pairs of bases. A sequence of three bases is the code for a particular amino acid - known as a triplet or the triplet code. The order of the bases controls the order in which amino acids are assembled to produce a particular protein