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  • Got Lactase? Blood Glucose Data Analysis

    Got Lactase? Blood Glucose Data Analysis

    Activity

    Students interpret the results of two different tests for lactase persistence.

  • Polymerase chain reaction (PCR)

    Polymerase chain reaction (PCR)

    Animation

    (54 sec) PCR is a standard laboratory technique that allows amplification of specific segments of DNA based on complementarity.

  • 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.

  • Watson constructing base pair models

    Watson constructing base pair models

    Clip

    (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.

  • Polymerase chain reaction

    Polymerase chain reaction

    Animation

    (1 min 28 sec) Polymerase chain reaction, or PCR, is a technique for making many copies of a specific DNA sequence. DNA is repeatedly heated and cooled in the presence of primers that bracket the desired sequence and of the enzyme Tac polymerase. In as few as 30 cycles, a billion copies of the target sequence can be made.

  • Pauling triple helix model

    Pauling triple helix model

    Animation

    (29 sec) One of the failed hypothetical models of DNA is Linus Pauling's triple helix model. This structure would be unstable under normal cellular conditions.