Cold Spring Harbor Laboratory
Dna Learning Center: Dna Molecule, Dna Unzip
The DNA double helix contains two sequences of nucleotide code letters than run along the molecule. Untwist the spiral and DNA can be seen as two parallel strands. That's why its sometimes called the double helix. Unzip the strands and...
Cold Spring Harbor Laboratory
Dolan Dna Learning Center: Dna Molecule: Triple Helix
A description of how the triple-helix DNA model was a precursor to the accepted double-helix model of our DNA. [0:27]
Cold Spring Harbor Laboratory
Dolan Dna Learning Center: Dna Molecule: Chargaff's Ratios
Learn about base pairing in DNA, and how the ratios of adenine to thymine and guanine to cytosine are equal. [0:47]
University of Wisconsin
The Why Files: Scottish Sheep Shocker! New Pair of Genes
This article provides a discussion of DNA and how it replicates. Includes a chromosome map of a human male, a close-up of chromosomes just before cell division and a close up of a DNA molecule.
PBS
Nova: Journey Into Dna
Investigate the structure and function of DNA using this animated presentation.
Other
Putting Dna to Work: The Dna Sequence
Get a feel for how to read a DNA sequence from several links located on this site.
National Health Museum
Access Excellence: Dna Molecule Two Views
Access Excellence provides an excellent graphic showing the structure of the DNA molecule and its components.
National Health Museum
Access Excellence: Structure of the Dna Molecule
Read a history of the discovery and study of DNA and its structure. Links to a graphic, other references, and classroom activities.
Smithsonian Institution
Lemelson Center: Spark!lab: Extract Dna
Dissect strawberries and use common household ingredients to successfully extract and examine the strawberry DNA.
University of Missouri
University of Missouri: Biotech Adventure: Dna Structure
DNA Helix, DNA structure, DNA bases, Nucleotides, strands of DNA, Bonding in DNA, and bonding between bases are the topics delved into in this thorough site.
Famous Scientists
Famous Scientists: Francis Crick
Discover Francis Crick, British molecular biologist, physicist, and neuroscientist who jointly won a Nobel Prize for his discoveries concerning the molecular structure of nucleic acids.
PBS
Nova: Picturing the Molecules of Life
Retrace the development of our knowledge of nucleic acids by viewing pictures of nucleic acids (both DNA and RNA) taken in 1952, 1973, 1979, 1980, 1984 and 2001.
National Health Museum
Access Excellence: Dna Sequencing (Dry Lab Activity)
This site is an advanced level hands-on activity to explain the Di-deoxy sequencing of DNA.
University of Missouri
Biotech Adventures: Dna Replication
Replication 1, Replication 2, 5'to 3' direction, polymerase replication, and ligase replication are the topics delved into in this complete site. The text is supplemented with animation for clarity.
National Health Museum
Access Excellence: Dna Structure
Access Excellence provides an interesting graphic which shows the helical structure of DNA from the molecular to chromosomal scale.