The Structures of DNA and RNA 97 DNA STRUCTURE 98

DNA Is Composed of Polynucleotide Chains 98 Each Base Has Its Preferred Tautomeric Form 100 The Two Strands of the Duubfg Helix Are Held Together by Base Pairing in an Ami parallel Orientation 100 The Two Chains of the Double Helix Have

Complementary Sequences 101 1 Iydrogen Bonding Is Important for the Specificity of Base Pairing 102 Bases Can Flip Oui from the Double Helix 102 DNA Is Usually a Right-l landed Double Flelix 103 The Double Helix Has Minor and Major Grooves 103

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