The double helix is a description of the molecular shape of a double-stranded DNA molecule. In 1953, Francis Crick and James Watson first described the molecular structure of DNA, which they ...

If you remember your high school biology course, you may recall some primitive pictures of DNA—illustrations of the double-helix that looked like a twisted, primary-colored ladder of kiddie blocks.

Flash required Journey into DNA by Rick Groleau Chances are you've seen an illustration of DNA's double-helix structure and even pictures of the chromosomes that comprise the human genome.

Deoxyribonucleic acid (DNA) is a molecule that encodes an organism's genetic blueprint. In other words, DNA contains all of the information required to build and maintain an organism.

Watson and Crick describe structure of DNA 1953 Photo: Model of DNA molecule In the late nineteenth century, a German biochemist found the nucleic acids, long-chain polymers of nucleotides, were ...

Scientists discovered a new type of DNA that provided new information on gene structure and function. I-motifs are a four-strand twisted knot that is not exactly the shape of the double helix.

Scientists at Stanford University have created an expanded molecule of DNA with a double helix wider than any found in nature. Besides being more heat resistant than natural DNA, the new version ...