QUESTION 1 Match the discovery with the individual or groups that discovered it. (names may be used once, more than once or not at all) v Found that the ratio of Guanine and Cytosine and the ratio of A. Watson and Crick. Adenine and Thymine equals approximately one in all organisms investigated. B. Fred Griffith C. Hershey and Chase. v Using Streptococcus pnemoniae and mice, identified the 'Principle of Transformation' D. Erwin Chargaff v Discovered using Streptococcus pnemoniae and mice that the transforming principle was DNA. not RNA or proteins. E. Avery, MacLeod and McCarthy. F. Rosalind Franklin. v Used radioactively sulphur and phosphorous to demonstrate with T4 bacteriophage that DNA is the heritable material. v Used X-ray crystallography on DNA and discovered a critical piece of data needed in identifying the structure of DNA. v Performed no experiments but was able to discover the secondary helical structure of DNA. QUESTION 2 How many hydrogen bonds form between A and T? 4.

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