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DNA is a linear polymer of nucleotides whose phosphates bridge the 3' and 5' positions of succesive 2-deoxy-D-ribose residues, and nitrogenous bases such as purines and pyrimidines. In detail, DNA is a) a helical molecule, and b) its planar aromatic bases form a stack of parallel rings that is parallel to the fiber axis.
There are several configurations of the DNA molecule. The A, B, and C forms of DNA are right-handed, double-stranded helices which, in fibrous form, are stable at intermediate, high, and low relative humidities, respectively, and have 11, 10, and 9.3 base pairs per turn of double helix. The left-handed helix of B-DNA structure is refered as Z-DNA (it contains 12 bases pairs per turn of double helix, and has only a single groove. B-DNA (the so-called Watson-Crick structure) is regarded as the native form because its X-ray pattern resembles that of the DNA in intact sperm heads, and is a double helix with around 20 angstroms diameter. The planes of the bases are nearly perpendicular to the helix axis and conserve the so-called "complementary base pairing" (that is, adenine base always is in front of a guanine base, as well as thymine is always in front of a cytosine.
The "ideal" B-DNA helix has 10 base pairs (bp ) per turn (a helical twist of 36o per bp) and, the aromatic bases have van der Waals thicknesses of 3.4 angstroms and are partially stacked on each other (known as base stacking). Finally, the helix has a pitch (rise per turn) of 34 angstroms.
Wiki User
∙ 7y ago
Wiki User
∙ 13y agoThe DNA molecule is best described as a double helix.
Wiki User
∙ 7y agoThe best description is a double helix of Deoxyribose held together by paired bases adenine thymine, cytosine and guanine.
Wiki User
∙ 7y agoThe Watson-Crick structure.
Baby Gangsta
base, sugar ring, and phosphate
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Approximately when was the structure of DNA described?
It wasnt found
The structure of DNA is described as a?
Double helix - with a deoxyribose (sugar) and phosphate backbone, and nitrogenous bases in the centre.
What best describes the structure of a DNA molecule?
A double helix of two strands of DNA linked together with sugar-phosphate backbones with bases on the inside.
What is the DNA structure of boron?
Boron is an element. It does not have DNA.
Watson and crick deduced the structure of this molecule?
The molecuar structure of DNA
Was the Structure DNA first described DNA first described?
1950
What contribution did Francis Crick make to the discover of the structure of DNA?
they described the structure of DNA
When was DNA structure first described?
1950
Approximately what was the structure of DNA first described?
1950
Who are the 2 men that first described the structure of DNA?
watson and crick
Identify the two men that first described the structure of DNA?
Watson and Crick
Who first correctly described the molecular structure of DNA?
Sir James Watson and Sir Francis Crick first described the molecular structure of DNA correctly. They not only mentioned the fact that DNA is a helical structure, but also described how the constituting molecules are arranged in the helix. The base-pairing, sugar-phosphate backbone were first described by Watson and Crick.
What word describes the shape of DNA and RNA?
Double stranded, single stranded. DNA can be described as having a double helix structure.
What is the DNA code best described as?
A recipe for making proteins.
How can The structure of No Name Woman best be described?
unconventional
Approximately when was the structure of DNA described?
It wasnt found
Can you give a hard science question?
What is the DNA structure of a brontosaurus.What is the DNA structure of a brontosaurus.What is the DNA structure of a brontosaurus.What is the DNA structure of a brontosaurus.What is the DNA structure of a brontosaurus.What is the DNA structure of a brontosaurus.
