Francis Crick and James Watson
a double helix
In almost all cases, DNA is found has a double-helix.It's only some bacterial species that have single-helix DNA.
double helix
DNA, and the shape is also known as a double helix.
The double helix
The whole DNA strand is a double helix.
Both DNA and RNA can exist in the double helix form, but only DNA is completely stable as a double helix. The double helix RNA is usually only short "hairpin" sections folding back on itself, never the long essentially linear form of double helix DNA.
DNA
DNA is a double helix, or a twisted ladder.
The name of the shape of DNA is called double helix. There are two long strands of DNA connected in several points. These strands twist and look like a spiral or a spring.
DNA is organized in a double-helix fashion.
Double Helix