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Chapter_9_to_post - Chapter 9 Chapter 9 DNA: Molecule of...

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Unformatted text preview: Chapter 9 Chapter 9 DNA: Molecule of Heredity Chapter 9 What Is the Structure of DNA? Nucleotide Structure: 3 Parts CH CH 2 2 H H O O H H OH OH H H H H H H OH HO P O O N N HC HC N N C C C C C C CH CH N N N N NH NH 2 2 Pentose Sugar Phosphate Group Nitrogenous Base (1 of 4) Deoxyribose The Four Nucleotides of DNA (pg. 151) Thymine Cytosine Adenine Guanine The Structure of a Nucleotide Strand P end S end Base Pairing in DNA 1. Adenine and Thymine always form pairs Two H Bonds 1. Guanine and Cytosine always form pairs 3 H Bonds Complementary strands run in opposite directions Complementary base pairs hold the two DNA strands together DNA is a double helix of two nucleotide strands The Watson-Crick Model of DNA Structure (from 9-3) P S P S X-ray Diffraction of DNA 1. Maurice Wilkins & Rosalind Franklin knew that DNA formed a helix by the patterns seen in X-ray diffraction The discovery of DNA Pauling Wilkins & Franklin Watson & Crick Model of DNA Why is DNA important?...
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Chapter_9_to_post - Chapter 9 Chapter 9 DNA: Molecule of...

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