Helix hydrogenbonds

Model of the DNA double helix. Hydrogenbonding bridges keep the two DNA strands together. Without hydrogen bonds, life would not be possible. 

These interesting observations could be explained through the formation of triple helix DNA on the electrode surface. Side- and main-chain atoms may interact with a particular DNA base-pair of another chain or with more than one base-pair supporting each other in interwoven hydrogenbonding networks that stabilize the contacts between the bases, forming a triple helix on the DNA adsorbed to the electrode surface [9-11]. The triple helix DNA is formed by interaction of the ssDNA in the bulk... 

Following formation of the polymerase-promoter complex, several turns of the DNA double helix untwist, forming a bubble and exposing 14 or so base pairs of the two strands. Appropriate ribonucleotides then line up by hydrogenbonding to their complementary bases on DNA, bond formation occurs in the... 

For the formation of the double-helix structure we best consider DNA as an amphiphilic polymer with the hydrophobic interactions driving association and the hydrophilic interactions - mainly electrostatic due to phosphate groups but also hydration plays a role - opposing association. Other interactions, like hydrogenbonding and base stacking, while not driving association, control the three-dimensional structure formed. 

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