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Kind of chemical bond maintaining pair in DNA molecule

Which kind of chemical bond maintains the pairing of each and every chain in the DNA molecule?

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To form DNA molecule, purine bases join to pyrimidine bases by intermolecular bonds termed as hydrogen bonds. Hydrogen bonds take place whenever there is hydrogen near one of such electronegative elements: fluorine, oxygen and nitrogen.

In such situations hydrogen appears as like having lost electrons for such elements and a very strong polarization is made. The extremely positive hydrogen attracts pairs of electrons of other molecules forming a hydrogen bond.

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