Extended data:
DNA carries the genetic information necessary for the synthesis of RNA and protein, and is a biomacromolecule necessary for the development and normal operation of organisms.
DNA is a macromolecular polymer composed of deoxynucleotides. Deoxynucleotide consists of base, deoxyribose and phosphoric acid. There are four kinds of bases: adenine (a), guanine (g), thymine (t) and cytosine (c).
In the molecular structure of DNA, two deoxynucleotide chains are coiled on the same central axis to form a double helix structure. The deoxyribose phosphate chain is outside the spiral structure, and the base faces inside. The two deoxynucleotide chains are complementary in reverse, and they are connected by base pairing formed by hydrogen bonds between bases, forming a fairly stable combination.
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