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Phoebus Levene
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found that DNA contained adenine, guanine, thymine, cytosine, deoxyribose, and a phosphate group -
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Erwin Chargaff
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adenine almost equal to thymine, guanine almost equal to cytosine; A=T and G=C; Chargaff's Rule -
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Alfred Hershey and Martha Chase
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only DNA of a virus needs to enter a bacterium to infect it; proved genes are made of DNA -
Rosalind Franklin
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discovered the existence of the A and B forms of DNA, helical structure of DNA has two strands, sugar-phosphate backbone of DNA lies on the outside of the molecule -