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  • Demonstration: Quorum sensing molecules

    Demonstration: Quorum sensing molecules

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    (50 sec) Quorum sensing signal molecules have parts that are common between species as well as species-specific parts.

  • Watson constructing base pair models

    Watson constructing base pair models

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    (1 min 42 sec) During the process of trying to elucidate the structure of DNA, Jim Watson made some cardboard models to try to understand how DNA nucleotides are paired. It helped him visualize how hydrogen atoms of paired nucleotides interact with each other to form a symmetrical structure that fits the double helix model.

  • Enzymes That Are Not Proteins: The Discovery of Ribozymes

    Enzymes That Are Not Proteins: The Discovery of Ribozymes

    Clip

    (19 min 4 sec) Listen to past HHMI President Dr. Thomas Cech discussing his Nobel Prize-winning discovery of RNA's catalytic properties.