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  1. Identification of DNA as the Genetic Material
    1. Experiments with pneumococcus suggested that DNA is the genetic material
    2. Hershey and Chase provided evidence that the genetic material injected into the bacterial cytoplasm is T2 phage DNA
    3. RNA functions as the genetic material in some viruses
  2. Nucleic acid structure
    1. Nucleotides are the building blocks of nucleic acids
    2. Nucleotides are linked together to form a strand
    3. A few key events led to the discovery of the double helix structure
    4. Chargaff found that DNA has a biochemical composition in which the amount of A equals T and the amount of G equals C
    5. Watson and Crick deduced the double helical structure of DNA
    6. The molecular structure of the DNA double helix has several key features
    7. DNA can form alternative types of double helices
    8. DNA can form a triple helix, called triplex DNA
    9. The three-dimensional structure of DNA within chromosomes requires additional folding and the association with proteins
    10. RNA molecules are composed of strands that can fold into secondary and tertiary structures







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