Which statement best describes the structure of DNA?

The structure of DNA is best described as double-stranded with complementary base pairing. This means that DNA consists of two long strands that wind around each other to form a double helix. Each strand is made up of a sequence of nucleotides, which are the building blocks of DNA. The key feature of DNA's structure is that the bases on each strand pair specifically with complementary bases on the opposite strand: adenine pairs with thymine, and cytosine pairs with guanine. This complementary base pairing is critical for the accurate replication of DNA during cell division and for the transmission of genetic information.

The double-stranded nature of DNA, along with its specific base pairings, allows it to stabilize the genetic code and facilitates the mechanisms for protein synthesis and genetic regulation. In contrast, the other options do not accurately capture the fundamental structure of DNA, as they either misrepresent the strand configuration, the pairing of bases, or the presence of hydrogen bonds, all of which are essential characteristics of DNA.