Final answer:
The genetic information in DNA is arranged in a double helix structure, resembling a spiral staircase with a backbone of sugar and phosphate, and steps made of paired bases (A-T and C-G).
Step-by-step explanation:
The arrangement of genetic information in a DNA molecule is best described as a double helix structure. This resembles a molecular spiral staircase where two strands of DNA wind around each other. Each strand has a backbone made of deoxyribose (sugar) and phosphate groups. The steps of this staircase are represented by the nitrogenous bases adenine (A), thymine (T), cytosine (C), and guanine (G), which pair together (A with T and C with G) through hydrogen bonds. This arrangement not only gives DNA its structural integrity but also enables the storage and transmission of genetic information.