DNA (deoxyribonucleic acid) - a molecule that carries most of the genetic instructions , Watson and Crick - worked together to discovery the structure of DNA, Chargaff's rule - # guanines = # cytosine and #adenine = #thymines, Rosalind Franklin - used x-ray diffraction to understand the structure of DNA, hydrogen bonds - hold the double helix together, nitrogen bases - make up the steps or rungs of the DNA ladder, base pair rule - A always pairs with T and C always pairs with G, nucleotides - building block of nucleic acids: contain a nitrogen base, sugar and phosphate, purines - adenine and guanine, pyrimidines - cytosine and thymine, double helix - twisted ladder shape of the DNA molecule,

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