Question: The two strands in a DNA molecule are held together by hydrogen bonding between corresponding bases on each strand. Buy why hydrogen bonds? Need Assignment Help? Use your knowledge of intermolecular forces and the function of DNA to discuss why hydrogen bonds are the best IMF for this task and not London-dispersion (LD) or dipole-dipole (D-D) forces. Think about how the properties of DNA would change if these other forces held it the strands together.