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 ...

A DNA double helix is made of two strands running in opposite directions. Each strand is made of four bases -- A, T, C, and G -- that pair up in specific ways to form rungs along the strands.

Insider Cost The price of a helix piercing ranges from about $30 to $75, says Massick, but varies significantly depending on which type you choose and where you get it done. For example, a double ...