DNA shapes refer to the three-dimensional structures of DNA molecules. These shapes include HELICES, HELIXES, and SPIRALS. HELICES are formed when two strands of DNA twist around each other in a right-handed spiral. HELIXES are similar to HELICES, but they are formed when two strands of DNA twist around each other in a left-handed spiral. SPIRALS are formed when a single strand of DNA winds around itself in a spiral shape. All three of these shapes are important for the proper functioning of DNA.