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Anonymous users2024-02-06In 1953, Watson and Crick jointly proposed the double helix structure of the DNA molecule, in which paired bases are arranged, marking the development of biological science into the stage of molecular biology The proposal of the DNA double helix structure began, which opened the era of molecular biology Molecular biology has brought the study of biological macromolecules into a new stage, so that the study of heredity has penetrated into the molecular level, the "mystery of life" has been opened, and people have a clear understanding of the composition of genetic information and the way of transmission In the next nearly 50 years, New disciplines such as molecular genetics, molecular immunology, and cell biology have sprung up, and the mysteries of life have been clarified more clearly from a molecular point of view, and DNA recombination technology has opened up broad prospects for the research and application of bioengineering methods In the process of human beings finally uncovering the mysteries of life, the discovery of the double helix structure of DNA molecules, and the application of bioinformatics methods in molecular systematics to analyze genomic DNA
So the answer is: Watson and Crick; Bases
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Anonymous users2024-02-05dCreative thinking is not a special ability of the mind of a genius, as long as the average person conforms to the law, he can also produce many new discoveries, so it is excluded.
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Anonymous users2024-02-04Answer AIn 1953, Watson and Crick jointly proposed the model of the double helix structure of DNA molecules, which is the greatest achievement of biological science in the last century, marking the development of biological science into the stage of molecular biology. Darwin's On the Origin of Species is the result of the descriptive biology stage. Mendel's law of heredity was re-proposed, marking the beginning of experimental biology in biology.
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Anonymous users2024-02-03a. The DNA molecule is composed of two strands, which are opposite and parallel, and A is correct;
b. The DNA molecules of deoxyribose sugar and phosphoric acid are alternately linked, arranged on the outside to form the basic skeleton, B is correct;
C. From the analysis of C, it can be seen that C is wrong;
d. The bases on the two chains are connected by hydrogen bonds to form base pairs, and d is correct Therefore, c
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Anonymous users2024-02-02A.B., Watson, and Crick according to Wilkins.
and the DNA diffraction pattern provided by Franklin and the related data to deduce the DNA molecule.
It has a spiral structure, A is wrong, B is correct;
In the late 40s, Chagov found that the base composition of DNA of different species is different, but the adenine in it.
The number is equal to the thymine number, and the guanine number is equal to the cytosine number, which is not proposed to be paired with T and C and G, and the CD is wrong
Therefore, b
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Anonymous users2024-02-01In 1953, Watson and Crick jointly proposed the double helix structure of the DNA molecule, in which paired bases are arranged, marking the development of biological science into the stage of molecular biology The proposal of the DNA double helix structure began, which opened the era of molecular biology Molecular biology has brought the study of biological macromolecules into a new stage, so that the study of heredity has penetrated into the molecular level, the "mystery of life" has been opened, and people have a clear understanding of the composition of genetic information and the way of transmission In the next nearly 50 years, New disciplines such as molecular genetics, molecular immunology, and cell biology have sprung up, and the mysteries of life have been clarified more clearly from a molecular point of view, and DNA recombination technology has opened up broad prospects for the research and application of bioengineering methods In the process of human beings finally uncovering the mysteries of life, the discovery of the double helix structure of DNA molecules, and the application of bioinformatics methods in molecular systematics to analyze genomic DNA
So the answer is: Watson and Crick; Bases
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Anonymous users2024-01-31A. The DNA molecule is composed of 2 reversed and parallel deoxyribonucleotide chains, and A is correct;
B. The bases on the two strands of the DNA molecule are connected by hydrogen bonds to form base pairs, and B happens to burn accurately;
C. The principle of base complementarity pairing in DNA molecule Xiaoque deficiency is that A is paired with T, G is paired with C, and C is correct;
d. The DNA molecules of deoxyribose sugar and phosphoric acid are alternately linked, arranged on the outside to form the basic skeleton, D is wrong
Therefore, d
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1. The development of new energy and the use of energy - everything that can provide energy can be called energy. Let us recall that during the first period of the industrial leather wheel preparation for the early life, due to the hydraulic engine machine was subjected to natural bars.
The Merchant of Venice, based on Shakespeare's play of the same name, tells the story of Venice in the 15th century. Antonio, a businessman, borrowed money from Shylock, a Jew, to help his friend Bassanio, and wrote a contract to cut off a pound of flesh from his body if he did not repay the loan on time. Bassanio's marriage proposal was successful, but Antonio was unable to repay the loan due to the shipwreck, and was sued by Shylock in court.
Just look it up on the library.
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