A single helix molecule is a type of macromolecule that has a structure resembling a spiral staircase. It consists of a backbone of repeating units, with side chains branching off from the backbone. The molecule twists and turns along its longitudinal axis, forming a helical shape. This type of molecular structure is commonly found in biological systems, such as DNA and RNA. These are composed of a sugar-phosphate backbone and nitrogenous bases that extend outward from the backbone, creating the familiar double helix of DNA and single helix of RNA. Other examples of single helix molecules include some proteins and certain synthetic polymers.