The introduction of DNA double helix structure has opened the era of molecular biology, which has made the research on heredity go deep into the molecular level, and the "mystery of life" has been uncovered, and people have a clear understanding of the composition and transmission of genetic information. 1953, Watson and Crick discovered the double helix structure of DNA, which opened the era of molecular biology, made the study of heredity go deep into the molecular level, uncovered the "mystery of life", and people clearly understood the composition and transmission mode of genetic information. In the next 50 years, new disciplines such as molecular genetics, molecular immunology and cell biology have sprung up, which have clarified the mystery of life more clearly from the molecular point of view. DNA recombination technology has opened up a broad prospect for the research and application of bioengineering means.

Main chain (trunk)

It is formed by alternately connecting deoxyribose and phosphate groups through ester bonds. There are two main chains, which, like "twisting", hover around a coaxial center in the right hand direction.

Parallel to each other and in opposite directions to form a double helix structure. The main chain is outside the helix, which just shows the hydrophilicity of the main chain composed of sugar and phosphoric acid. On the outside of DNA is a skeleton composed of deoxyribose and phosphoric acid alternately connected. The so-called double helix refers to the shape of two main chains.

Main chain (trunk)

It is formed by alternately connecting deoxyribose and phosphate groups through ester bonds. There are two main chains, which, like "twisting", hover around a coaxial center in the right hand direction.

Parallel to each other and in opposite directions to form a double helix structure. The main chain is outside the helix, which just shows the hydrophilicity of the main chain composed of sugar and phosphoric acid. On the outside of DNA is a skeleton composed of deoxyribose and phosphoric acid alternately connected. The so-called double helix refers to the shape of two main chains.