what is a double helix
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double helix double helix. n. The coiled structure of double-stranded DNA in which strands linked by hydrogen bonds form a spiral configuration, with the two strands oriented in opposite directions.
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Nucleic acid double helix Two complementary regions of nucleic acid molecules will bind and form a double helical structure held together by base pairs. In molecular biology, the term double helix refers to the structure formed by double-stranded molecules of nucleic acids such as DNA.
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double helix double helix. The three-dimensional structure of double-stranded DNA, in which polymeric nucleotide strands whose complementary nitrogen bases are linked by hydrogen bonds form a helical configuration. The two DNA strands are oriented in opposite directions. double helix in Culture.
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double helix double helix. A structural motif of nucleic acids in which 2 complementary chains of DNA and/or RNA spiral around each other as paired nucleobases attached to a deoxyribose phosphate backbone.
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Alpha helix The alpha helix (α-helix) is a common secondary structure of proteins and is a righthand-coiled or spiral conformation (helix) in which every backbone N-H group donates a hydrogen bond to the backbone C=O group of the amino acid four residues earlier (hydrogen bonding).ince the α-helix is defined by its hydrogen bonds and backbone conformation, the most detailed experimental evidence for α-helical structure comes from atomic-resolution X-ray crystallography such as the example shown at right.
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What is DNA? DNA is a double helix formed by base pairs attached to a sugar-phosphate backbone. DNA, or deoxyribonucleic acid, is the hereditary material in humans and almost all other organisms.Nearly every cell in a person’s body has the same DNA.ucleotides are arranged in two long strands that form a spiral called a double helix. The structure of the double helix is somewhat like a ladder, with the base pairs forming the ladder’s rungs and the sugar and phosphate molecules forming the vertical sidepieces of the ladder.
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Nucleic acid double helix In molecular biology, the term double helix refers to the structure formed by double-stranded molecules of nucleic acids such as DNA. The double helical structure of a nucleic acid complex arises as a consequence of its secondary structure, and is a fundamental component in determining its tertiary structure.
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What is DNA? Nucleotides are arranged in two long strands that form a spiral called a double helix. The structure of the double helix is somewhat like a ladder, with the base pairs forming the ladder’s rungs and the sugar and phosphate molecules forming the vertical sidepieces of the ladder.An important property of DNA is that it can replicate, or make copies of itself.NA is a double helix formed by base pairs attached to a sugar-phosphate backbone. DNA, or deoxyribonucleic acid, is the hereditary material in humans and almost all other organisms.
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MB 16.1 The pattern in this photo implied that the helix was made up of two strands, contrary to a three-stranded model that Linus Pauling had proposed a short time earlier. The presence of two strands accounts for the now-familiar term double helix.
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Why is DNA called a double helix? Because there are two DNA strands in the DNA molecule and they both rotate around each other in a helix formation. So two helixes = double helix. Because two helixes run over each other in antiparallel fashion in a DNA structure. Single stranded DNA is mostly unstable therefore it forms double stranded or double helix.
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DNA: Double Helix DNA Double Helix: The double-stranded helical model for DNA is shown in the graphic on the left. The easiest way to visualize DNA is as an immensely long rope ladder, twisted into a cork-screw shape.
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Why is DNA called a double helix? Confidence votes 31.1K. Its structure is two spirals interlaced; double meaning two, helix being the technical word for such a shape. DNA is known as the double helix because it coils up into chromosomes and looks like a winding staircase.
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helix double helix, Watson-Crick helix a representation of the structure of DNA, consisting of two coiled chains arranged antiparallel to each other, each containing information completely specifying the other chain.elix. 1. spiral (2). 2. the superior and posterior free margin of the pinna of the ear. α-helix, alpha helix the structural arrangement of parts of protein molecules in which a single polypeptide chain forms a right-handed helix stabilized by intrachain hydrogen bonds.
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double helix The coiled structure of double-stranded DNA in which strands linked by hydrogen bonds form a spiral configuration, with the two strands oriented in opposite directions.
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helix A three-dimensional spiral curve. In mathematical terms, a helix can be described as a curve turning about an axis on the surface of a cylinder or cone while rising at a constant upward angle from a base. 2. Something, such as a strand of DNA, having a spiral shape.
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The Discovery of the  Molecular Structure of DNA - The Double Helix The two strands of the double helix are anti-parallel, which means that they run in opposite directions. The sugar-phosphate backbone is on the outside of the helix, and the bases are on the inside. The backbone can be thought of as the sides of a ladder, whereas the bases in the middle form the rungs of the ladder. Each rung is composed of two base pairs.
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The Discovery of the  Molecular Structure of DNA - The Double Helix It appeared in April 1953 in the scientific paper where James Watson and Francis Crick presented the structure of the DNA-helix, the molecule that carries genetic information from one generation to the other.
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- The shape of DNA is normally described as a double-helix, which is two strands twirled loosely around each other. The DNA molecule is shaped like an extremely long ladder twisted into a helix, similar in appearance to the shape of a spiral stairway.
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double helix The double helix describes the appearance of double-stranded DNA, which is composed of two linear strands that run opposite to each other, or anti-parallel, and twist together. Each DNA strand within the double helix is a long, linear molecule made of smaller units called nucleotides that form a chain.
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- They are actually made up of chains of base pairs of nucleic acids stretching from as few as three to millions. When those pairs combine in super long chains (DNA), they make a shape called a double helix.
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Helix Bridge The Helix Bridge, previously known as the Double Helix Bridge, is a pedestrian bridge linking Marina Centre with Marina South in the Marina Bay area in Singapore. It was officially opened on 24 April 2010 at 9 pm, however only half was opened due to ongoing construction at the Marina Bay Sands.he 280 m bridge is made up of three 65 m spans and two 45 m end spans. If the steel were stretched out straight from end to end, it would measure 2.25 km in length.
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Nucleic acid double helix The term entered popular culture with the publication in 1968 of The Double Helix: A Personal Account of the Discovery of the Structure of DNA, by James Watson. The DNA double helix polymer of nucleic acids, held together by nucleotides which base pair together. In B-DNA, the most common double helical structure, the double helix is right-handed with about 10–10.5 base pairs per turn. This translates into about 20-21 nucleotides per turn.
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Why is DNA considered a double helix? The double helix in DNA consists of two right-handed polynucleotide chains that are coiled about the same axis. The heterocyclic amine bases project inward toward the center so that the base of one strand interacts or pairs with a base of the other strand.r to put it more simply. The molecule of DNA has two helical (spiral) structures. Think of a ladder, grab the ends of the ladder and twist, first helix. Now take that twisted ladder and wrap it around a pole, second helix.
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- 1 The two strands are wound round each other to form a double helix.  The two strands are joined together by hydrogen bonds between the bases. The bases therefore form base pairs, which are like rungs of a ladder.
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The Double Helix Watson is a U.S. molecular biologist, geneticist and zoologist, best known as one of the co-discoverers of the structure of DNA in 1953 with Francis Crick. In 1998, the Modern Library placed The Double Helix at number 7 on its list of the 100 best nonfiction books of the 20th century.
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Scientific Evidence: We Have More Than Two Strands of DNA In the double helix there are two strands of DNA coiled into a spiral.” Dr. Fox says there are major changes and mutations occuring in our DNA. We are evolving. “We will be developing twelve helixes. During this time, which seems to have started maybe 5 to 20 years ago, we have been mutating.