What is the structural shape of DNA?

The structural shape of DNA is a double helix. This configuration consists of two long strands of nucleotides twisted around each other, resembling a spiral staircase. The double helix structure is stabilized by hydrogen bonds between complementary nitrogenous bases on the opposite strands—adenine pairs with thymine, and cytosine pairs with guanine. This arrangement not only provides stability to the molecule but also allows for the efficient replication and transcription of genetic information.

The double helix shape is crucial for the process of DNA replication, where the two strands can separate and serve as templates for creating new complementary strands. Additionally, the double helix structure allows for the packing of DNA into chromosomes, fitting a large amount of genetic material into a compact space within the cell nucleus.