DNA Structure is a term used to describe the physical structure of DNA, which is composed of two helical STRANDS that are intertwined in a double HELIX formation. The HELIX is a spiral-shaped structure made up of five letters, while the STRANDS are composed of seven letters. The double HELIX is an eleven letter structure that is formed when the two STRANDS twist around each other. This structure is essential for the replication and expression of genetic information.