DNA Helix

A DNA helix is the structure of DNA, which is the molecule that carries genetic information in living organisms. It resembles a twisting ladder or spiral staircase, with two long strands composed of sugar and phosphate molecules. These strands are connected by pairs of nitrogen bases—like rungs on the ladder—matching in specific ways. The twisting occurs because of chemical properties, forming a double helix. This structure allows DNA to efficiently store, replicate, and transmit genetic information essential for life processes.