Explaining the DNA structure, 3D animation with basic narration
The Double Helix
Considering the complex functions of DNA, its structure is simple. The two DNA strands run in opposite directions and twist together to form a stable double helix. During replication or gene transcription, the 2 strands unwind and unzip. This allows one or both strands to be copied after which the strands are able to re-associate and twist back to their helical structure.
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- ID: 15524
- Source: DNALC.DNAi
Animation of 2D DNA model becoming three dimensional.
The structure of DNA, that Watson and Crick discovered, suggests how genetic information is passed on.
Although the chemistry was wrong, Linus Pauling's triple-stranded DNA model was a catalyst for James Watson and Francis Crick to solve the structure of DNA.
Explore DNA's structure.
See how information in DNA is copied to make new DNA molecules.
DNA base pairs
DNA is used as a template for copying information. Knowing the structure of DNA, scientists speculated and then proved that DNA is the template for copying the genetic code.
James Watson and Francis Crick explain how they solved the structure of DNA. Erwin Chargaff explain how he measured the levels of each of the four nitrogenous bases.
15492. Discovering the double helix structure of DNA, James Watson, video with 3D animation and narration
James Watson used cardboard cutouts representing the shapes of the DNA bases to figure out how bases pair.
Because it contains the directions for assembling the components of the cell, DNA is often thought of as the "instruction book" for assembling life.