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B-form DNA. The information from the base composition of DNA, the knowledge of dinucleotide structure, and the insight that the X‑ray crystallography suggested a helical periodicity were combined by Watson and Crick in 1953 in their proposed model for a double helical structure for DNA.
DNA is the information molecule. It stores instructions for making other large molecules, called proteins. These instructions are stored inside each of your cells, distributed among 46 long structures called chromosomes. These chromosomes are made up of thousands of shorter segments of DNA, called genes.
Estructura secundaria del DNA: forma B o modelo de Watson y Crick. Vemos aquí dos dinucleótidos complementarios, que emparejan sus bases para formar un fragmento de B-DNA bicatenario (o de doble hebra): 5' pTpC 3'. 3' ApGp 5'.
Tres formas principales de ADN son bicatenarias y conectadas por interacciones entre pares de bases complementarias. Estos son los términos forma A, forma B y forma Z ADN.
This chapter describes the structures of DNA forms called alternative DNA conformations that are different from the canonical B-DNA helix. Also discussed are the requirements for the formation of alternative DNA structures, as well as their possible biological roles.
13 de nov. de 2021 · The structure of B-DNA, the physiological form of the DNA molecule, has been a central topic in biology, chemistry and physics. Far from uniform and rigid, the double helix was revealed as a flexible and structurally polymorphic molecule.
(B) B-DNA, the structure proposed by Watson and Crick, is the most common conformation in most living cells. (C) Z-DNA, unlike A- and B-DNA, is a left-handed helix.
