Cold Spring Harbor Laboratory
The DNA Molecule Is Shaped like a Twisted Ladder
One of the first models of DNA appeared to be a triple helix. Young scientists learn about the many scientists who worked to find the shape of DNA. They observe multiple models, tests, and experiments to understand the conclusions. An...
American Museum of Natural History
American Museum of Natural History: Dna Base Pairs O Logy Card
Flip this interactive OLogy card to find questions and answers, fast facts, and other bite-size pieces of information to help you understand DNA bases A, T, G, and C.
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 Utah
University of Utah: Learn Genetics: Build a Dna Molecule
Build a short strand of DNA using the base pairing rule. An interactive learning experience that reinforces the base pairing rule.