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  • Running a Virochip Experiment

    Running a Virochip Experiment

    Animation

    (2 min 15 sec) A sample is put on a Virochip microarray, and results are compared to databases of all known viral sequences.

  • Biodiversity and Evolutionary Trees

    Biodiversity and Evolutionary Trees

    Activity

    Construct evolutionary trees by sorting seashells. To accompany the lecture series Exploring Biodiversity: The Search for New Medicines and the Sorting Seashells Click and Learn interactive.

  • Bacterial Quorum Sensing

    Bacterial Quorum Sensing

    Click & Learn

    Understand how quorum sensing works by reasoning through experiments involving genetically-engineered bioluminescent bacteria.

  • Sorting Seashells

    Sorting Seashells

    Click & Learn

    Explore principles of taxonomy by sorting seashells according to their morphological characteristics and constructing an evolutionary tree.

  • The LUX operon controls light production

    The LUX operon controls light production

    Animation

    (2 min 25 sec) A single transcription factor controls this operon, which contains five genes necessary to produce bioluminescence.

  • The molecular cascade in bacterial quorum sensing

    The molecular cascade in bacterial quorum sensing

    Animation

    (3 min 20 sec) Quorum sensing regulates gene expression by a protein phosphorylation cascade that controls transcription.

  • Mutant mice with crossed excitation hop

    Mutant mice with crossed excitation hop

    Clip

    (1 min 18 sec) Kangaroo-like hopping when spinal cord excitatory interneurons cross the midline to stimulate both sides.

  • HIV life cycle

    HIV life cycle

    Animation

    (4 min 52 sec) How HIV infects a cell and replicates itself using reverse transcriptase and the host's cellular machinery.

  • Protease inhibitors

    Protease inhibitors

    Animation

    (1 min 6 sec) Protease inhibitors prevent maturation of viral proteins inside HIV particles.

  • AZT blocks reverse transcriptase

    AZT blocks reverse transcriptase

    Animation

    (1 min 46 sec) HIV's reverse transcriptase mistakes AZT for thymidine. Once incorporated, AZT stops reverse transcription.

  • Genetic Switches

    Genetic Switches

    Click & Learn

    Learn about how gene switches can control expression of genes in different tissues.

  • Visualizing Gene-Expression Patterns

    Visualizing Gene-Expression Patterns

    Click & Learn

    Learn about the different ways scientists are able to detect when genes are being expressed in various tissues.

  • Evolution: Constant Change and Common Threads

    Evolution: Constant Change and Common Threads

    Lecture

    How has the amazing diversity of plants and animals evolved? What can fossils, butterflies, and stickleback fish tell us about the deep common ancestry of all living forms?

  • Paintbrush Gene

    Paintbrush Gene

    Animation

    (49 sec) In two related Drosophila species, a so-called paintbrush gene is activated to "paint" the pigment on the body. In one species, an extra switch activates the gene, resulting in spotted wings.

  • Pitx1 Expression

    Pitx1 Expression

    Animation

    (55 sec) In the stickleback fish, pelvic-fin reduction resulted from changes in the regulatory switch elements of the Pitx1 gene. In the marine ancestor, the Pitx1 gene is activated in the pelvic-fin region during development to generate the fin. In the pelvic-reduced stickleback, the regulatory switch that normally turns on the Pitx1 gene is either missing or non-functional.

  • PPAR-gamma Activation in the Fat Cell

    PPAR-gamma Activation in the Fat Cell

    Animation

    (2 min 49 sec) The PPAR-gamma receptor activates certain genes in a fat cell, resulting in the storage of fat and changes in hormone levels.

  • Classroom Activities: Pedigree Analysis Activity

    Classroom Activities: Pedigree Analysis Activity

    Activity

    To accompany the lecture series Learning from Patients: The Science of Medicine.

  • The p53 Gene and Cancer

    The p53 Gene and Cancer

    Click & Learn

    This Click and Learn explains the structure and function of the p53 protein as well as how the protein’s activity is regulated.

  • Learning from Patients: The Science of Medicine

    Learning from Patients: The Science of Medicine

    Lecture

    As part of the 2003 Holiday Lectures on Science, Dr. Bert Vogelstein and Dr. Huda Y. Zoghbi discuss how their patients have led to a deeper understanding of the genetic and molecular bases of neurological disorders and cancer. Thanks to these patients, researchers can now apply the knowledge gained to diagnosis, prevention, and the search for cures.

  • Learning from Mice: The Science of Transgenic Technology

    Learning from Mice: The Science of Transgenic Technology

    Clip

    (11 min 8 sec) What do humans, flies, and worms have in common? More than you might think. See how transgenic organisms are engineered, and how they enable researchers to study genetic diseases.

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