Monday, November 15, 2010

DNA Double Helix


DNA macromolecules is a normal double helix Two polynucleotide chains, held together by weak thermodynamic forces, form the DNA molecule

Characteristics of the DNA double Helix

* Two strands of DNA forming a helical spiral, winding around the helix axis spiral right
* The two polynucleotide chains running in opposite directions
* The sugar-phosphate backbone of the two DNA strands wind around the helix as a fence line spiral stairs
* The bases of nucleotides in particular helix, stacked one above the other as staircases, spiral staircases

DNA Helix Axis

Helix axis is most obvious to look directly at the axis sugar-phosphate backbone on the outside of the spiral where the polar phosphate groups (red and yellow atoms) can interact with the polar environment Nitrogen (blue atoms) containing the base inside, stacking perpendicular to the propeller 

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