1. **Problem:** Describe DNA in an image. 2. DNA is the molecule that stores genetic information in living things. 3. Its basic structure is a **double helix**, which looks like a twisted ladder. 4. The two long sides of the ladder are made of **sugar and phosphate** molecules. 5. The rungs in the middle are made of **base pairs**: $A$ pairs with $T$, and $C$ pairs with $G$. 6. If you were labeling an image, you could point out the double helix shape, the sugar-phosphate backbone, and the matching base pairs. 7. Final description: DNA is a twisted ladder-shaped molecule called a double helix that carries genetic instructions in cells.