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The structure a DNA molecule depends on its environment. In aqueous enviromnents, including the majority of DNA in a cell, B-DNA is the most common structure. The A-DNA structure is dominates in dehydrated samples and is similar to the double-stranded RNA and DNA/RNA hybrids. Z-DNA is a rarer structure found in DNA bound to certain proteins.
In May 1952, Raymond Gosling, a graduate student working under the supervision of Rosalind Franklin, took an X-ray diffraction image, labeled as "Photo 51", [206] at high hydration levels of DNA. This photo was given to Watson and Crick by Maurice Wilkins and was critical to their obtaining the correct structure of DNA. Franklin told Crick and ...
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This image is a derivative work of the following images: File:DNA simple2.svg licensed with PD-self 2008-01-16T05:36:35Z Forluvoft 272x287 (25442 Bytes) ...
This image is a derivative work of the following images: File:Eukaryote_DNA.svg licensed with Cc-by-sa-3.0 2012-08-05T09:52:30Z Radio89 1189x734 (655126 Bytes)
Removed white background. Text is now Text. 14:19, 1 June 2009: 691 × 336 (110 KB) Bibi Saint-Pol: Original SVG: 14:09, 1 June 2009: 691 × 336 (110 KB) Bibi Saint-Pol {{Information |Description= {{en|DNA replication or DNA synthesis is the process of copying a double-stranded DNA molecule.
Deoxyribonucleic acid (DNA) is a nucleic acid containing the genetic instructions used in the development and functioning of all known living organisms. The chemical DNA was discovered in 1869, but its role in genetic inheritance was not demonstrated until 1943. The DNA segments that carry this genetic information are called genes.
Photo 51 is an X-ray based fiber diffraction image of a paracrystalline gel composed of DNA fiber [1] taken by Raymond Gosling, [2] [3] a postgraduate student working under the supervision of Maurice Wilkins and Rosalind Franklin at King's College London, while working in Sir John Randall's group.