FIGURE 4.1 The basic structure of DNA and RNA. DNA is double-stranded, whereas RNA is single-stranded. The nucleotide, thymine, in DNA is replaced with uracil in RNA. Image adapted from the National Human Genome Research Institute Talking Glossary of Genetic Terms, available at http:// www.genome.gov/Pages/Hyperion/DIR/VIP/Glossary/IUustration/rnaxfm?key=ribonudeic%20acid %20%28RNA%29.
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