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The strong bonds between the DNA chains are the hydrogen bonds (H-bonds). The H-bonds exist between the base pairs. 2 H-bonds exist between Adenine and Thymine and only 3 H-bonds exist between Guanine and Cytosine. This means that A-T bonds are stronger than C-G, this difference arises purely because of slight chemical differences in the bases.

Within the chains the strong bonds are covalent. These covalent bonds are found between the sugar group of one nucleotide and the phosphate group of another.

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12y ago

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