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  • Paired DNA strands

    Paired DNA strands

    Animation

    (1 min 18 sec) DNA has a double helix structure. If untwisted, DNA looks like two parallel strands. Each strand has a linear sequence of A, C, G, and T. The precise order of the letters carries the coded instructions. One strand is a complementary image of the other: A always pairs with T, and C always pairs with G.

  • Scanning Life's Matrix: Genes, Proteins, and Small Molecules

    Scanning Life's Matrix: Genes, Proteins, and Small Molecules

    Lecture

    In four presentations, Stuart L. Schreiber, PhD, and Eric S. Lander, PhD, open a window onto the fast-paced world of genomic science and chemical genetics.

  • The Double Life of RNA

    The Double Life of RNA

    Lecture

    In four lectures, Nobel laureate Thomas R. Cech, PhD, discusses the ability of RNA to act as more than just an intermediary between DNA and proteins.