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CHAPTER 9 - DNA The Molecule of Heredity

CHAPTER 9 - DNA The Molecule of Heredity - CHAPTER 9 DNA...

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Humans have 98% DNA identical to chimpanzees How did scientists discover that genes are made of DNA? Something in S train makes it deadly when mixed with something live Griffith discovers transformation (Figure9-1) Treated cell extracts with protein, carbohydrate, RNA, and DNA digesting enzymes Only cell extracts treated with DNA-digesting enzymes lost their transforming ability DNA transforms bacteria What is the transforming material? Avery, MacLeod, and McCarty Nucleotides contain a phosphate, deoxyribose sugar, and N-containing base (pg 151) Nucleotide Bases in DNA Always assembled from the P end to the S end Covalent bond between the sugar of one nucleotide and the phosphate of a second A Nucleotide Strand What is the structure of DNA? CAGCT AGCTG TCGAC - A to T , C to G Unknown What is the complement of this nucleic acid strand? (AGCTG) Double helix of 2 nucleotide strands Complementary vase
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