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Chapter9

Chapter9 - Chapter 9 DNA The Molecule of Heredity How Did...

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How Did Scientists Discover That Genes Are Made of DNA? Transformed Bacteria revealed the link between genes and DNA. Griffith Discovers Transformation 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 Structure of DNA? DNA is composed of four nucleotides. DNA is a double helix of two nucleotide strands. Hydrogen bonds between complementary bases hold the two DNA strands together. The order of nucleotides in DNA can encode vast amounts of information. Nucleotide Bases in DNA Nucleotides contain a phosphate, deoxyribose sugar, and N-Containing base. A Nucleotide Strand Always assembled from the P end to the S end. Covalent bond between the sugar of one nucleotide and the phosphate of a second. Clicker Question: What is the complement of this nucleic acid strand? (AGCTG)
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Chapter9 - Chapter 9 DNA The Molecule of Heredity How Did...

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