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Which bond is used to stabilize the double helix of DNA?

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Which bond is used to stabilize the double helix of DNA?

(a) Hydrophobic bond

(b) Hydrogen bond

(c) Covalent bond

(d) Ionic bond

I have been asked this question in a national level competition.

This interesting question is from Nucleic Acids in portion Biomolecules and Catalysis of Life Sciences

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Right option is (b) Hydrogen bond

The explanation: Polynucleotide runs on the backbone of the phosphate-sugar chain. The base pairing of these nucleotide gives secondary structure. The secondary structure of DNA is its double helix which held together by hydrogen bonding between the bases.

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