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OpenStudy (anonymous):
12. Which type of chemical bond maintains the pairing of each chain in the DNA molecule?
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OpenStudy (alphadxg):
To form the DNA molecule, purine bases bind to pyrimidine bases by intermolecular bonds called hydrogen bonds. Hydrogen bonds occur when there is hydrogen near one of these electronegative elements: fluorine, oxygen or nitrogen. In such conditions hydrogen looks like having lost electrons for those elements and a very strong polarization is created. The highly positive hydrogen attracts pairs of electrons of other molecules making a hydrogen bond.
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