At this point, each chromosome actually consists of a set of duplicate chromatids that are held together by the centromere.The centromere is the point of attachment of the kinetochore, a protein structure that is connected to the spindle fibres (part of a structure that pulls the chromatids to opposite ends of the cell). The DNA structure has the following characteristics: The strands of the DNA are helically wounded, every single strand forms a right-handed coil. Cleaves viral polyprotein. In E.Coli the key enzyme is made up of THREE subunits, products of the “uvr.A, uvr-B, uvr-C genes”, and is called the “ABC Exonuclease”. Last Updated on July 1, 2020 by Sagar Aryal. Became fascinated with molecular structure of DNA after hearing Wilkins talk at a Naples conference about DNA and x-ray crystallography photographs of DNA. A. The DNA molecule must somehow specify how to assemble proteins, which are needed to regulate the various functions of each cell. It has antiparallel double helix, rotating clockwise (right hand) and made up of sugar- phosphate back bone combined with base pairs or purine-pyrimidine. SlideShare Explore Search You. The structure of DNA was best explained by Watson and Crick model. J D Watson and Francis Crick (1953 ) haveproposed a double helical structure (Model) of DNA ,for which they have received the Nobel Prize of1962.According to this Model some facts about DNA are asfollows : DNA has a double helical structure made bytwisting around of 2 very long thin polymeric strandsaround a common (imaginary) axis. Protein_id "YP_009725301.1". It is believed that such structures are important for molecular recognition of DNA by proteins and enzymes. Biology of A-, B-and Z-DNA. If you're seeing this message, it means we're having trouble loading external resources on our website. Home; Explore Page 1 of 153,471 results for dna and rna. Other Types of DNA Structure: It is now recognized that besides double helical structure, DNA also exists in certain unusual structures. According to this model, DNA is made up of two polynucleotide chains that are wound around each other in an anti-parallel fashion to form a double helix. [1][2] In most organisms, genes are made of DNA, where the particular DNA sequence determines the function of the gene. What kind of structure could serve this purpose without varying from cell to cell? Upload; Login; Signup; Submit Search. DNA structure. Utilizamos seu perfil e dados de atividades no LinkedIn para personalizar e exibir anúncios mais relevantes. MULTIPLE CHOICE TYPE (Choose the best option out of the four alternatives a, b, c and d) 1. Acknowledgements Figure 1 Different views of the DNA helix. DNA structure | Quadruplex DNA - this lecture explains the quadruplex DNA structure. Slideshow search results for dna and rna ... SlideShare Explore Search You. A detail ppt about Genome organization with focus on all levels of organization. The bases are perpendicular to the fiber axis and joined together in pairs. The structure of DNA double helix and how it was discovered. Understanding the structure of DNA has been the key to understanding how genes work. Home; Explore Page 1 of 1,222,894 results for structure. DNA Structure Video - What is the structure? Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The plant cells can then perform a process that normally takes place only in bacteria. This is in fact needed for the DNA to discharge its functions in an appropriate manner. DNA microarrays can analyze the expression of tens of thousands of genes simultaneously. Scientists have obtained the genes for nitrogen fixation from bacteria and have incorporated those genes into plant cells. 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