DNA

DNA was thought to contain equal amounts of A, T, T, and C. Chargaff found that the base composition of DNA differs among species.
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DNA Under an electron microscope
Other interesting points:
DNA is an acid because of the phosphate groups between each deoxyribose. This is the primary reason why DNA has a negative charge.
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DNA polymerase I
Because all four normal nucleotides are present, chain elongation proceeds normally until, by chance, ...
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DNA (deoxyribose nucleic acid)
a helical, double stranded molecule composed of four different nucleotide subuints (A, T, G, and C) that carries the genetic instructions from one generation to the next ...
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DNA methylation
A post-replication process. Cytosine residues in CpG sequences are methylated, forming gene-specific methylation patterns. Methylation of promoter regions correlates with gene expression patterns.
Related ...
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DNA is a very large molecule; the image here shows only a tiny fraction of the typical molecule. If an entire molecule of DNA from the virus "bacteriophage lambda" were shown at this scale, the image would be 970 meters high.
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DNA Repair
Multiple systems for repairing damage to DNA have evolved, probably because of the importance of the DNA information content.
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DNA Replication Complex Revealed in Exquisite Detail
A team of Harvard Medical School researchers have established the 3-dimensional, atom-by-atom structure of T7 DNA polymerase at work.
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DNA is a double helix, with bases to the center (like rungs on a ladder) and sugar-phosphate units along the sides of the helix (like the sides of a twisted ladder).
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Search for DNA in these other databases too
Definition of DNA :
See deoxyribonucleic acid.
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A section of DNA that has been inserted into a vector molecule, such as a plasmid or a phage chromosome, and then replicated to form many identical copies. See also clone
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ...
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DNA in brief
This section presents a brief and simple overview of DNA.
Genes can be loosely viewed as the organism's "cookbook"; ...
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DNA (deoxyribonucleic acid): the molecule that encodes genetic information. DNA is composed of two anti-parallel strands which wind about a common axis to form a double helix.
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The strand of DNA that does not carry the information necessary to make a protein. The non-coding strand is the mirror image of the coding strand and is also known as the antisense strand.
explained:
Listen to a detailed explanation.
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We have undertaken genomic transplantation studies involving the transfer of mitochondrial DNA (mtDNA) from PD patients with a complex-I defect to a novel nuclear background.
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DNA Repair Genes
A third type of gene associated with cancer is the group involved in DNA repair and maintenance of chromosome structure. Environmental factors, such asionizing radiation, UV light, and chemicals, can damage DNA.
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DNA fingerprinting
Method of isolating and visualizing of sequences of DNA developed in 1984 by Alec Jeffreys.
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DNA: the Instruction Manual for All Life
Cell Biology Animations: DNA-structure, replication, transcription, and translation
DNA-RNA-Protein Synthesis (hands-on learning module) ...
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DNA sequencing: Determining the order of bases in a segment of DNA.
Domi nant gene: A gene which, when present on a chromosome, passes on a certain physical characteristic, thereby dominating over a recessive gene present on another chromosome.
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DNA (Deoxyribonucleic acid). An organic acid and polymer composed of four nitrogenous bases--adenine, thymine, cytosine, and guanine linked via intervening units of phosphate and the pentose sugar deoxyribose.
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DNA transcription - process in which molecules of RNA are synthesized in which a strand of DNA acts as a template.
dolichol - special lipid molecule that holds precursor oligosaccharides, prior to addition to proteins in the ER membrane ...
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DNA gyrase
A topoisomerase that removes supercoils from DNA by first producing double-strand breaks and then sealing them.
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DNA ligase
(ly-gaze)
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A linking enzyme essential for DNA replication; catalyzes the covalent bonding of the 3' end of a new DNA fragment to the 5' end of a growing chain.
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DNA fingerprinting: a technique that uses electrophoresis to match DNA molecules to one another for identification purposes.
DNA polymerase: the enzyme that joins all the nucleotide components to one another to form a long strand of nucleotides.
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DNA POLYMERASE - A polymerase which synthesizes DNA (see POLYMERASE).
DNase - see DEOXYRIBONUCLEASE.
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DNA ligase - protein that joins (ligates) DNA strands; used by cells for DNA repair, by molecular biologists for gene cloning.
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DNA sequenced from 17-20 MY old magnolia
In the paper I explain here, the authors (Golenberg et. al., 1990) sequenced an 820 bp region (the rbcL gene) from the chloroplast DNA of a compression fossil of a magnolia.
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DNA Deoxyribonucleic acid; the long, double-helix molecule in the nucleus of cells that contains the genetic code and directs the development and functioning of all cells.
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DNA (deoxyribonucleic acid): The molecule responsible for storing and transmitting genetic information.
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DNA
Polymerase
: A group of enzymes mainly involved in copying a single-stranded DNA molecule to make its complementary strand. Eukaryotic DNA polymerases participate in chromosomal replication, repair, crossing-over and mitochondrial replication.
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A DNA open reading frame:
...ATG ACA TGT AAA GAT AGA CTA ACC TTT TGG... ...Met Thr Cys Lys Asp Arg Leu Thr Phe Trp...
Same bases, different 'frame': ...
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the DNA strand is expressed into a trait only if it is transcribed to RNA.
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Satellite DNA A genomic DNA fraction which has a different density to the main body of genomic DNA and therefore forms a separate band (satellite) during density gradient ultracentrifugation.
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Ribosomal DNA genes
The genes that make the three RNA components of the ribosome - the particle (also containing 60 or more proteins) that is responsible for making proteins within the cell.
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lagging strand The DNA strand that, during replication, must be synthesized in the direction opposite to that in which the replication fork moves. Synthesized via a series of fragments called Okazaki fragments.
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A matrix composed of a highly purified form of agar that is used to separate larger DNA and RNA molecules ranging 20,000 nucleotides. (See Electrophoresis.) Alleles.
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Alu repetitive sequence -- the most common dispersed repeated DNA sequence in the human genome accounting for 5% of human DNA. The name is derived from the fact that these sequences are cleaved by the restriction endonuclease Alu.
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DNA - deoxyribonucleic acid is the double-helix molecule holding the genetic information of organisms that, along with protein, composes the chromatin ...
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Polynucleotides are either RNA or DNA.
They guide the formation of exact copies of their own sequence through complementary pairing of nucleotides subunits (U with A and G with C).
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Contains DNA and mitoribosomes. Has a double membrane and the inner membrane may contain numerous folds (cristae). The inner fluid phase has most of the enzymes of the tricarboxylic acid cycle and some of the urea cycle.
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DeoxyribonucleicAcid(DNA) the genetic code material consisting of pairs of nitrogenous bases bonded to a "ladder" of phosphate and ribose molecules
(de = from down out; deoxy = without oxygen) ...
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Definition: Mass of genetic material composed of DNA and proteins that condense to form chromosomes in eukaryotic cell division. Chromatin is located in the cell's nucleus.
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Ballistic particle-mediated gene transfer. Complementary DNA molecules are adsorbed to gold particles and shot by a pressure gas jet into tissues or culture cells.
HIGH-PRESSURE FREEZING ...
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double stranded
two adjacent strands. For example DNA has two adjacent polynucleotide strands wound into a spiral shape.
duodenum
Part of the small intestine connecting the stomach to the ileum.
Covered in: ...
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The components of a typical prokaryotic cell are a cell wall, a cytoplasmic membrane, a single molecule of DNA, ribosomes and the cytoplasm. All other components, although they might be present, are essentially dispensable.
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All organisms pass on their heredity via the genetic material which is based upon the nucleic acid DNA using a universal genetic code.
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