Double helix
(Science: molecular biology) conformation or shape that two linear strands of dna assume when bonded together and become twisted into a helix.
Double helix
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Double helix
The term Double helix (plural helices) describes the structure of DNA as first published by James Watson and Francis Crick in 1953.
Double Helix
Double helix is the description of the structure of a DNA molecule. A DNA molecule consists of two strands that wind around each other like a twisted ladder.
The Double Helix
The double helix of DNA has these features:
It contains two polynucleotide strands wound around each other.
The phosphate group bonded to the 5' carbon atom of one deoxyribose is covalently bonded to the 3' carbon of the next.
Double helix: The twisted-ladder shape that two linear strands of DNA assume when complementary nucleotides on opposing strands bond together.
Double helix: The shape that two linear strands of DNA assume when bonded together.
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double helix
The form of native DNA, referring to its two adjacent polynucleotide strands wound into a spiral shape.
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Double helix. Describes the coiling of the antiparallel strands of the DNA molecule, resembling a spiral staircase in which the paired bases form the steps and the sugar-phosphate backbones form the rails.
Double helix
The structural arrangement of DNA, which looks something like an immensely long ladder twisted into a helix, or coil.
DNA double helix - the structure of our genetic material; human DNA consists of two complementary strands which twist around each other like two spiral staircases.
Double helix
- A term used to describe the configuration of a DNA molecule. The helix consists of two spiraling strands of nucleotides held together with chemical bonds.
double helix A helix composed of two molecules winding around each other, as in DNA.
dourine Disease of horses and other equids caused by Trypanosoma equiperdum.
down feathers Feathers that provide insulation for adult and immature birds.
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).
base pair a pair of hydrogen-bonded nitrogenous bases (one purine and one pyrimidine) that join the component strands of the DNA double helix.
These bonds, which bind the complementary strands of DNA together in a double helix, are broken at elevated temperatures (about 95° C). Each single-stranded piece of DNA (ssDNA) is then built upon to form a new, double-stranded molecule (dsDNA).
Grooves in the DNA double helix.
The deoxyribose sugar ring.
Is the deoxyribose ring flat or puckered?
Location of the sugar in the DNA double helix.
Are the two strands of DNA parallel or anti-parallel?
Structure of GC and AT base pairs.
Proteins that unwind the DNA double helix.
Hemimethylation
Double stranded DNA in which only one strand is methylated at a particular site. For example, at GATC sites in E.
B-DNA helix A right-handed double helix with the following characteristics: the two strands are antiparallel; the bases are inside the helix and the phosphates and deoxyribose sugars are on the outside; adenine forms hydrogen bonds with thymine, ...
deoxyribonucleic acid (DNA) A nucleic acid composed of two polynucleotide strands wound around a central axis to form a double helix; the repository of genetic information.
DNA is composed of two anti-parallel strands which wind about a common axis to form a double helix.
A postulated mode of DNA replication in which an intact double helix acts as a template for a new double helix; known to be incorrect.
DNA is always found in the cells as a double helix. In prokaryotic cells (and mitochondria and chloroplasts), there is a single circular DNA molecule.
The model showed that DNA is a double helix with sugar-phosphate backbones on the outside and the paired nucleotide bases on the inside, in a structure that fit the spacing estimates from the X-ray diffraction data.
A Celebration of the Genome: 50 Years of DNA -- April 2003 marked the 50th anniversary of James Watson and Francis Crick's Nobel Prize winning description of the DNA double helix.
DNA helicase - an enzyme that participates in DNA replication by unwinding the double helix near the replication fork
DNA ligase - fills in nicks and gaps made in polynucleotide strands ...
Two nitrogenous (purine or pyrimidine) bases (adenine and thymine or guanine and cytosine) held together by weak hydrogen bonds. Two strands of DNA are held together in the shape of a double helix by the bonds between base pairs.
Complementary (As in complementary strand) having the sequence of nucleotides which will form a base paired double helix with another strand of DNA or RNA.
Complementary DNA see cDNA ...
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. Double helix: A common name for DNA; ...
Two strands of DNA are held together in the shape of a double helix by the bonds between base pairs.
Base sequence The order of nucleotide bases in a DNA molecule.
 See also: Helix, DNA, Strand, Molecule, Trans
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