Deoxyribonucleic acid DNA structure

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Commonly referred to as nucleic acid deoxyribonucleic acid deoxyribonucleic acid (DNA), Miescher, a Swiss biochemist in 1800, was discovered by well known. In 1953, James Watson, Francis Crick and Rosalind Franklin, DNA structure, the famous series of innovative techniques, images of a double helix, including X-ray crystallography. Now, almost 60 years later, we are very far from it, the secret is to understand the structure of macromolecules.

The chemical structure of DNA

As the name suggests, the DNA is a nucleic acid, a main chain of a sugar-phosphate chain nucleotide monomers (nitrogen bases) of a macromolecule is formed. DNA, the sugar is deoxyribose. Deoxyribose ring and the spine of the covalent linkage of phosphoric acid and of an alternative linked. DNA attached to formed with the other of the two parallel chains or strands. Beach, phosphoric acid, oxygen and hydroxyl groups on the other, on the basis of the position of the origin of five (5 ') and three (3) end. nitrogenous bases in the deoxyribose sugar link, and this configuration is called nucleotides.

The physical structure of the DNA

Nanoscale DNA (approximately 2.2 to 2.6 nm wide), but is usually measured in Angstroms (about 22 angstroms wide). The nucleotides in the middle of the molecule, the hydrogen bonds in the binding of complementary base beach, and I like the physical aspect of the molecule. Adenine (A), guanine (G), cytosine (C) and thymine (T): When connecting to the deoxyribose nucleotides are used as the four DNA bases. The four two purines (C & T) and two pyrimidines (A and G). Adenine and thymine are interconnected each other, and cytosine and guanine link. The beach is the order of the sequence is automatically beach complementarity.

They are opposite and interacting helical complementary DNA strands, as if the physical structure of DNA, the chemical properties of the two are parallel. The length of the DNA molecule in a cell and reproduce represents.The child (copy) and serve as a guide for cellular functions during cell division have received different amounts, depending on the kind.