uncoiled dna meaning
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DNA is packaged like a yoyo, scientists find Scientists knew the DNA could be uncoiled from the nucleosome, but it was assumed that the two ends were symmetric, meaning uncoiling the DNA would be like untying a shoe. University of Illinois researchers found that the DNA is actually very asymmetric, like the string wrapped around a yoyo.
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Translations for dna gyrase DNA gyrase, often referred to simply as gyrase, is an enzyme that relieves strain while double-strand DNA is being unwound by helicase. It is also known as DNA topoisomerase II. This causes negative supercoiling of the DNA. Bacterial DNA gyrase is the target of many antibiotics, including nalidixic acid, novobiocin, and ciprofloxacin.
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- In molecular biology, junk DNA is a collective label for the portions of the DNA sequence of a chromosome or a genome for which no function has yet been identified.
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DNA DNA. deoxyribonucleic acid: an extremely long, double-stranded nucleic acid molecule arranged as a double helix that is the main constituent of the chromosome and that carries the genes as segments along its strands: found chiefly in the chromatin of cells and in many viruses. [1930–35]. (dē′ĕn-ā′).
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DNA DNA. deoxyribonucleic acid: an extremely long, double-stranded nucleic acid molecule arranged as a double helix that is the main constituent of the chromosome and that carries the genes as segments along its strands: found chiefly in the chromatin of cells and in many viruses. [1930–35].
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Eukaryotic DNA replication The process of semiconservative replication for the site of DNA replication is a fork-like DNA structure, the replication fork, where the DNA helix is open, or unwound, exposing unpaired DNA nucleotides for recognition and base pairing for the incorporation of free nucleotides into double-stranded DNA.
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DNA DNA. n. A nucleic acid that carries the genetic information in cells and some viruses, consisting of two long chains of nucleotides twisted into a double helix and joined by hydrogen bonds between the complementary bases adenine and thymine or cytosine and guanine.eoxyribonucleic acid, commonly called DNA, exists mainly in the nucleus and mitochondria of each cell in an organism. It consists of two long strands linked together in a structure resembling a ladder twisted into a spiral, called a double helix.
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- Synonym: extrachromosomal element. See also: DNA, chromosome. Plasmid (PLAZ mid) - a genetic structure that can replicate independently of the main chromosome(s) of a cell; usually, a circular DNA molecule in bacteria ( prokaryotes).
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DNA Supercoiling DNA is coiled in the form of a double helix. Let us define an axis about which both strands of the DNA coil. A bending or twisting of that axis upon itself (Fig. 23-10) is referred to as DNA supercoiling. As detailed below, DNA supercoiling is generally a manifestation of structural strain.
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- Genomic dna. Genomic dna. (Science: molecular biology) The dna which is found in the organisms genome and is passed on to offspring as information necessary for survival. The phrase is used to distinguish between other types of dna, such as found within plasmids.
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DNA Deoxyribonucleic acid (/diˌɒksiˌraɪbɵ.njuːˌkleɪ.ɨk ˈaesɪd/ ; ˈæSɪD) dna is a molecule that carries most of the genetic instructions used in the, development functioning and reproduction of all known living organisms and many. viruseshe sugar in DNA is 2-deoxyribose, which is a pentose (five-carbon) sugar. The sugars are joined together by phosphate groups that form phosphodiester bonds between the third and fifth carbon atoms of adjacent sugar rings. These asymmetric bonds mean a strand of DNA has a direction.
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Definitions &Translations deoxyribonucleic acid, desoxyribonucleic acid, 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.see more on Definitions.net ».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.
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chromosome 1. A linear strand of DNA and associated proteins in the nucleus of eukaryotic cells that carries the genes and functions in the transmission of hereditary information. 2. A circular strand of DNA in bacteria and archaea that contains the hereditary information necessary for cell life.
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DNA: Definition, Structure & Discovery Deoxyribonucleic acid or DNA is a molecule that contains the instructions an organism needs to develop, live and reproduce. These instructions are found inside every cell, and are passed down from parents to their children.he order of these bases is what determines DNA's instructions, or genetic code. Similar to the way the order of letters in the alphabet can be used to form a word, the order of nitrogen bases in a DNA sequence forms genes, which in the language of the cell, tells cells how to make proteins.
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- noun, Genetics. 1. DNA in which one or more segments or genes have been inserted, either naturally or by laboratory manipulation, from a different molecule or from another part of the same molecule, resulting in a new genetic combination. Origin of recombinant DNA.
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DNA barcoding DNA barcoding. Not to be confused with the DNA barcode involved in optical mapping of DNA, nor with the antibody barcoding used to identify proteins. DNA barcoding is a taxonomic method that uses a short genetic marker in an organism's DNA to identify it as belonging to a particular species.
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DNA mitochondrial DNA (mtDNA) the DNA of the mitochondrial chromosome, existing in several thousand copies per cell and inherited exclusively from the mother. nuclear DNA (nDNA) the DNA of the chromosomes found in the nucleus of a eukaryotic cell.recombinant DNA DNA artificially constructed by insertion of foreign DNA into the DNA of an appropriate organism so that the foreign DNA is replicated along with the host DNA.NA (deoxyribonucleic acid). The abbreviation for deoxyribonucleic acid, the primary carrier of genetic information found in the chromosomes of almost all organisms.
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DNase DNase definition, deoxyribonuclease: any of several enzymes that break down the double-stranded or single-stranded DNA molecule into its component nucleotides. See more. Dictionary.com
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Topological challenges to DNA replication: Conformations at the fork Whereas the DNA in the bulk of the bacterial chromosome is (−) supercoiled, the conformation around the replication fork is much more complicated. The parental strands of DNA can be topologically constrained, whereas the daughter strands cannot (Fig.
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What does semi-conservative mean? (in terms of DNA replication)? Semiconservative replication means that when the double stranded DNA helix was replicated, each of the two double stranded DNA helices consisted of one strand coming from the original helix and one newly synthesized. When dna replicates, the two new molecules each have a strand of the old dna.
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DNA DNA - (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; DNA is the king of molecules.NA. deoxyribonucleic acid: an extremely long, double-stranded nucleic acid molecule arranged as a double helix that is the main constituent of the chromosome and that carries the genes as segments along its strands: found chiefly in the chromatin of cells and in many viruses. [1930–35].
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What shape does DNA take in Prokaryotes and Eukaryotes? DNA supercoiling is important for DNA packaging within all cells. Because the length of DNA can be thousands of times that of a cell, packaging this genetic material into the cell or nucleus (in eukaryotes) is a difficult feat. Supercoiling of DNA reduces the space and allows for a lot more DNA to be packaged.
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DNA DNA (deoxyribonucleic acid). A type of nucleic acid that constitutes the molecular basis of heredity. It is found principally in the nucleus of all cells where it forms part of the chromosome, or in the cytoplasm of cells lacking a nucleus, such as bacteria.NA, n an acronym for deoxyribonucleic acid. A type of nucleic acid that contains genetic instructions for the development of cellular life forms. Capable of replicating itself and of producing another type of nucleic acid known as RNA. n the DNA specific to a bacterial strain.
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- DNA. deoxyribonucleic acid: an extremely long, double-stranded nucleic acid molecule arranged as a double helix that is the main constituent of the chromosome and that carries the genes as segments along its strands: found chiefly in the chromatin of cells and in many viruses.[1930–35].NA. deoxyribonucleic acid: an extremely long, double-stranded nucleic acid molecule arranged as a double helix that is the main constituent of the chromosome and that carries the genes as segments along its strands: found chiefly in the chromatin of cells and in many viruses. [1930–35].
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Definitions &Translations DNA profiling. DNA profiling is a technique employed by forensic scientists to assist in the identification of individuals by their respective DNA profiles. DNA profiles are encrypted sets of numbers that reflect a person's DNA makeup, which can also be used as the person's identifier.NA profiling. DNA profiling is a technique employed by forensic scientists to assist in the identification of individuals by their respective DNA profiles. DNA profiles are encrypted sets of numbers that reflect a person's DNA makeup, which can also be used as the person's identifier.
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- What does DNA mean? deoxyribonucleic acid, desoxyribonucleic acid, 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