Final answer:
DNA is the material that makes up our chromosomes and stores our genetic information. It is described as a double helix that resembles a molecular spiral staircase.
Step-by-step explanation:
DNA, which stands for Deoxyribonucleic acid, is the material that makes up our chromosomes and stores our genetic information. It is described as a double helix that resembles a molecular spiral staircase. The structure of DNA consists of two strands that are wound around each other in a spiral shape, forming a ladder-like structure.