The chemical bond that holds the bases of the two strands of DNA together is

The chemical bond that holds the base pairs of the two strands of DNA together is a hydrogen bond. DNA is composed of two strands of nucleotides, which are composed of a sugar molecule, a phosphate group, and a nitrogen-containing base. The nitrogen-containing bases in DNA are adenine (A), cytosine (C), guanine (G), and thymine (T). The two strands of DNA are held together by hydrogen bonds between the nitrogen-containing bases. Adenine always bonds with thymine, and cytosine always bonds with guanine. These hydrogen bonds are relatively weak, but they are strong enough to hold the two strands of DNA together. Therefore, the chemical bond that holds the base pairs of the two strands of DNA together is a hydrogen bond.