DNA, and the shape is also known as a double helix.
DNA is shaped like a double helix also known as a "twisted ladder".
spiral chains
double helix
A DNA strand is shaped like a 'double helix'.
Bacteria are prokaryotes, that is, the DNA molecule is not enclosed in a membrane-bound nucleus as it is in the eukaryotes. In bacteria the DNA lies free in the cytosol in a region known as nucleoid. This is denser than the rest of the cytosol because of the presence of DNA and related protein molecules. Also the DNA in bacteria is not broken up in thread-like chromosomes but is a ring-like circular and continuous structure.
Watson and Crick
DNA is shaped like a double helix.
DNA Molecules
Chromosome.
A strand of DNA is shaped like a double-helix.
DNA helicases are proteins, while DNA molecules are nucleotides.