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Hace 5 días · DNA, organic chemical of complex molecular structure found in all prokaryotic and eukaryotic cells. It codes genetic information for the transmission of inherited traits. The structure of DNA was described in 1953, leading to further understanding of DNA replication and hereditary control of cellular activities.
The structure of DNA is dynamic along its length, being capable of coiling into tight loops and other shapes. In all species it is composed of two helical chains, bound to each other by hydrogen bonds. Both chains are coiled around the same axis, and have the same pitch of 34 ångströms (3.4 nm).
A DNA molecule consists of two long polynucleotide chains composed of four types of nucleotide subunits. Each of these chains is known as a DNA chain, or a DNA strand. Hydrogen bonds between the base portions of the nucleotides hold the two chains together ( Figure 4-3 ).
9 de oct. de 2019 · The structure of DNA. In the early 1950s, the identity of genetic material was still a matter of debate. The discovery of the helical structure of double-stranded DNA settled the matter — and...
En este artículo, exploraremos brevemente cómo se descubrió la estructura de doble hélice del ADN con el trabajo de James Watson, Francis Crick, Rosalind Franklin y otros investigadores. Luego revisaremos las propiedades de la doble hélice en sí.
Estructura del DNA. El DNA (ácido desoxirribonucleico) es el material genético de la célula, contenido en los cromosomas dentro del núcleo celular y las mitocondrias. Excepto ciertas células (p. ej., espermatozoides y óvulos y glóbulos rojos), el núcleo celular contiene 23 pares de cromosomas.
The basic structure of DNA is a double helix, which consists of two long strands of DNA wrapped around each other. Each strand consists of many nucleotides, each consisting of a sugar and phosphate group, which form the sugar-phosphate backbone of DNA, and a nitrogenous base, which determines the identity of each nucleotide.
