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Hydrogen bonds holding together base pairs, stabilization by aromatic stacking of successive bases, and unwinding of DNA strands.
The hydrogen bonding between complementary bases holds the two strands of DNA together. Hydrogen bonds are not chemical bonds. They can be easily disrupted. As the new nucleotides line up opposite each parent strand by hydrogen bonding, enzymes called DNA polymerases join the nucleotides by way of phosphodiester bonds.
Three types of bonds found in DNA are covalent and Ionic Bonds , hydrogen bonds and weak chemical bonds. The two strands in DNA are connected by chemical bonds between the bases such as adenine bonds with thymine, and cytosine bonds with guanine.
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