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| Modern Genetic Analysis Chapter 2. The Structure of Genes and Genomes The Nature of DNA Figure 2-2. The arrangement of the components of DNA. A segment of the double helix has been unwound to show the structures more clearly. (a) An accurate chemical diagram showing the sugar-phosphate backbone in blue and the hydrogen bonding of bases in the center of the molecule. (b) A simplified version of the same segment emphasizing the antiparallel arrangement of the nucleotides, which are represented as L-shaped structures with 5 phosphate "toes" and 3 "heels."

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