2.6.A1Crick and Watson’s elucidation of the structure of DNA using model making. DNA分子有两条方向平行(antiparallel)的多核苷酸链组成,中间的碱基依靠氢键联系在一起,形成特殊的双螺旋结构。A与T以两个氢键结合(RNA中是A和U),G与C以三个氢键结合,这种结合方式叫碱基互补配对(complementary base pairing)(...
第二节 DNA的结构Structure of DNA 第二节DNA的结构NA的结构 一、核酸的化学组成 DNA主要存在于细胞核，是染色质的主要成分；主要存在于细胞核，是染色质的主要成分；原核生物DNA主要存在于类核中主要存在于类核中；原核生物DNA主要存在于类核中；在核外也存在有少量DNA，如线粒体DNA、叶绿体DNA在核外也存在...
In the 1950s, Francis Crick and James Watson worked together to determine the structure of DNA at the University of Cambridge, England. Other scientists like Linus Pauling and Maurice Wilkins were also actively exploring this field. Pauling previously had discovered the secondary structure of proteins...
7.1.1 Describe the structure of DNA, including the antiparallel strands, 3' -5' linkages and hydrogen bonding between purines and pyrimidines. DNA is made up of two strands. At one end of each strand there is aphosphategroup attached to the carbon atom number 5 of the deoxyribose (this ...
In biology, "double helix" is a term used to describe the structure ofDNA. A DNA double helix consists of two spiral chains of deoxyribonucleic acid. The shape is similar to that of a spiral staircase. DNA is anucleic acidcomposed of nitrogenous bases (adenine, cytosine, guanine, and thymi...
It would be superfluous at a Symposium on Viruses to introduce a paper on the structure of DNA with a discussion on its importance to the problem of virus reproduction. Instead we shall not only assume that DNA is important, but in addition that it is the carrier of the genetic specificity...
growth and reproduction of all known organisms and viruses. Structure of DNA and RNA: DNA macromolecules consist of two polynucleotide strands that are intertwined to form a double helix. RNA macromolecules typically exist as single polynucleotide strands that are much shorter than comparative DNA molec...
DNA非常规的二级结构(Other forms of secondary structure of DNA).pdf,⼏种不常见的DNA ⼆级结构 (Some unusual secondary structures of DNA 1. 弯曲(Bending) 2. ⼗字型(Cruciforms) 3. 三螺旋(Triple helix) 4. G四联体(G-quadruplex) 5. 滑移错配DNA(Slipped m
3.3.1 Outline DNA nucleotide structure in terms of sugar (deoxyribose), base and phosphate. A nucleotideis made of the sugar deoxyribose, a base (which can be eitheradenine, guanine,cytosineor thymine) and a phosphate group. Below is a representation of a nucleotide. ...
Although DNA is the carrier of genetic information, it has limited chemical stability. Hydrolysis, oxidation and nonenzymatic methylation of DNA occur at significant rates in vivo and are counteracted by specific DNA repair processes. The spontaneous decay of DNA is likely to be a major factor in...