What is DNA?

  • (noun): (biochemistry) a long linear polymer found in the nucleus of a cell and formed from nucleotides and shaped like a double helix; associated with the transmission of genetic information.
    Example: "DNA is the king of molecules"
    Synonyms: deoxyribonucleic acid, desoxyribonucleic acid

DNA

Deoxyribonucleic acid (DNA) molecules are informational molecules encoding the genetic instructions used in the development and functioning of all known living organisms and many viruses. Along with RNA and proteins, DNA is one of the three major macromolecules that are essential for all known forms of life. Genetic information is encoded as a sequence of nucleotides (guanine, adenine, thymine, and cytosine) recorded using the letters G, A, T, and C. Most DNA molecules are double-stranded helices, consisting of two long polymers of simple units called nucleotides, molecules with backbones made of alternating sugars (deoxyribose) and phosphate groups, with the nucleobases (G, A, T, C) attached to the sugars. DNA is well-suited for biological information storage, since the DNA backbone is resistant to cleavage and the double-stranded structure provides the molecule with a built-in duplicate of the encoded information.

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Some articles on DNA:

Filter Binding Assay
... It measures affinities between two molecules (often protein and DNA) using a filter ... DNA is negatively charged due to the phosphate backbone and will not "stick" to the nitrocellulose on its own, however, any DNA that has been bound by protein will stick ... The exact amount of DNA "stuck" to the nitrocellulose is quantified by measuring the amount of radioactivity on the filter using a scintillation counter Protein and DNA are mixed in a series of microfuge ...
Flow Cytometry - Measurable Parameters
... complexity of cells cell pigments such as chlorophyll or phycoerythrin total DNA content (cell cycle analysis, cell kinetics, proliferation, ploidy, aneuploidy ...
DNA Lounge - History
... Brian Raffi who opened for business under the name DNA Lounge on November 22, 1985 ... Many of DNA's posters and flyers were designed by the San Francisco-based artist, Rex Ray ... During the early 90s, the DNA offered a black membership card for $10 that offered free entry most nights ...
History of DNA Research
... Further information History of molecular biology DNA was first isolated by the Swiss physician Friedrich Miescher who, in 1869, discovered a microscopic ... Levene suggested that DNA consisted of a string of nucleotide units linked together through the phosphate groups ... the first X-ray diffraction patterns that showed that DNA had a regular structure ...
Royal Jelly - Epigenetic Effects
... In spite of their identical clonal nature at the DNA level, they are strongly differentiated across a wide range of characteristics including ... shown that this phenomenon is mediated by an epigenetic modification of DNA known as CpG methylation ... the expression of an enzyme that methylates DNA in newly hatched larvae led to a royal jelly-like effect on the larval developmental trajectory the majority of individuals with reduced DNA methylation ...

Famous quotes containing the word dna:

    Here [in London, history] ... seemed the very fabric of things, as if the city were a single growth of stone and brick, uncounted strata of message and meaning, age upon age, generated over the centuries to the dictates of some now all-but-unreadable DNA of commerce and empire.
    William Gibson (b. 1948)