Who discovered the structure of DNA and what is it made of?

DNA was first discovered in 1869 by the German biochemist Michel. When Michel was a Ph.D., he wanted to determine the composition of lymphocyte proteins, but he discovered an unknown new substance that was neither soluble in water, acetic acid, nor in dilute hydrochloric acid and table salt solutions, and finally confirmed that this substance existed in the nucleus, so he named it "nucleoplasm". Later, Altmann, a famous Swedish biochemist, suggested that "nucleoplasm" be named "nucleic acid".

A nucleic acid is a polymer, and its basic unit is called a nucleotide. There are two main types of nucleotides in living organisms: one is ribonucleic acid (i.e., RNA) and the other is deoxyribonucleic acid (i.e., DNA).

The first to be introduced are Wilkins, a crystal diffraction expert from the Royal College of London, and Franklin, a young female scientist. They captured very clear X-ray diffraction** of DNA molecules, which provided an important basis and evidence for the analysis of DNA structure. The diffraction of DNAX rays** seen by Watson and Crick is not very clear, but it is possible that the DNA molecule has a helical structure.

In February 1953, Watson and Crick saw through Wilkins a very beautiful X-ray diffraction of DNA crystals taken by Franklin in November 1951.

The first and second floors are not right! 3rd floor best! My end!

DNA was discovered by a Swiss doctor named Friedrich Michel. But in many people's cognition, DNA was discovered by Watson and Crick, but in fact they discovered the double-stranded structure of DNA, and the earliest isolation of DNA can be traced back to the Swiss doctor mentioned above.

In 1869, Michel found some residual fluid in the used bandage, and he found some substances in this liquid that can only be observed with a microscope, so Michel began to observe such substances, and found that these substances were in a nucleus, and Michel did not know that this substance was DNA at that time, so he called it a nuclide. In the 20th century, Fibas Levine learned more about DNA, he learned about bases, sugars, and nucleotide units, so he thought that DNA could have many substances linked together.

But from the concept he put forward, we can see that the long chain of DNA is relatively short, and some of the substances are repeated in a fixed order, but they did not realize the importance of this substance at that time, and did not go deep**, a few years later, in 1937, William Asteberg sent an X-ray diffraction diagram, which clarified the relevant regularity of DNA structure for the first time, and also laid a certain foundation for later generations to understand DNA.

The invention of the doctor laid a very strong foundation for a lot of medical research now, and it can now be used for a lot of technical research, it can be used to find sinners, paternity testing, and to make highly corrupt nameless corpses or bones be identified with DNA, DNA is used in modern technology, and because of its uniqueness, it is important for everyone.

The above story only represents my personal opinion, if there are any mistakes, please understand.

The person who discovered it was Michel, a German biochemist, who discovered it in 1869; After the discovery of DNA, it has a great impact on the lifespan of offspring, and genetic testing can be carried out, and the core factors of aging can also be understood, which can drive the development of medicine, and can be used for the detection and prevention of diseases.

It was discovered by a Swiss doctor. It is this DNA that allows us to understand how genes change. And how we humans came to be.

It was discovered by the Athenians. After discovering it, people began to think about human beings. They are also aware of how the offspring came to be.

DNA molecule is a kind of polymer compound, its basic unit is deoxynucleotide, there are four kinds in total, respectively called adenine deoxynucleotide (A), guanine deoxynucleotide (G), cytosine deoxynucleotide (C), thymine deoxynucleotide (T); Each deoxynucleotide is made up of three parts: a nitrogenous base, a deoxyribose sugar, and a phosphoric acid. The DNA molecule is made up of two long strands of deoxynucleotides.

It is deoxynucleotides that make up DNA.

Many deoxynucleotides are linked together by certain chemical bonds to form deoxynucleotide chains, and each DNA molecule is made up of two deoxynucleotide chains. The characteristics of the structure of the DNA molecule are: the basic skeleton of the DNA molecule is the two backbone strands of phosphoric acid and deoxyribose alternating arrangement; The two backbones are parallel but reversed, coiled into a regular double helix structure, generally a right-handed helix, arranged on the outer side of the DNA molecule; The two strands are joined together by base pairing, and the bases are paired together by hydrogen bonds.

DNA is a double helix structure formed by hydrogen bonds between deoxynucleotide bases (adenine, guanine, thymine, cytosine) through complementary pairing of bases. Inside the deoxynucleotide, the phosphate group and the deoxyribose are linked by a 3,5 phosphodilipid bond. DNA is a reverse (right) double helix structure.

The basic unit of DNA molecule is deoxynucleotides, and many deoxynucleotides are connected by certain chemical bonds to form deoxynucleotide chains, and each DNA molecule is composed of two deoxynucleotide chains. The characteristics of the structure of the DNA molecule are: the basic skeleton of the DNA molecule is the two backbone strands of phosphoric acid and deoxyribose alternating arrangement; The two backbones are parallel but reversed, coiled into a regular double helix structure, generally a right-handed helix, arranged on the outer side of the DNA molecule; The two strands are joined together by base pairing, and the bases are paired together by hydrogen bonds.

DNA is genetic material, which is relatively stable; Able to replicate themselves precisely, so that genetic continuity can be maintained between parents and offspring; It can guide protein synthesis, control metabolic processes and trait development; Produce heritable variants under specific conditions.

What exactly is DNA? What forms DNA and why human DNA is similar to chickens.

DNA double helix structure.

In 1952, the Austrian-American biochemist Chagav (1905- ) determined the content of 4 bases in DNA, the DNA double helix structure.

It is found that the amount of adenine is equal to that of thymine and the amount of guanine is equal to that of cytosine. This made Watson and Crick immediately think that there is a pairwise correspondence between the four bases, forming the concept of adenine and thymine pairing, guanine and cytosine pairing.

The discovery of the double helix structure of DNA in this segment.

The proposer of the DNA double helix structure.

In February 1953, Watson and Crick saw through Wilkins a very beautiful picture taken by Franklin in November 1951 of the American scientist James Watson.

X-ray diffraction of DNA crystals** inspired them. Not only did they confirm that the DNA must be a helical structure, but they also analyzed the helix parameters. They took the judgment of Franklin and Wilkins and added it:

The phosphate group forms the backbone of two polynucleotide chains on the outer side of the helix in opposite directions; The bases are on the inside of the helix and correspond in pairs. For several days, Watson and Crick happily built models out of tin sheets and wire in their offices. On February 28, 1953, the first molecular model of the DNA double helix structure was finally born.