So we have these two important types of intermolecular bonds that play a role in forming our DNA double helix. Now not only that, but because the bases are essentially non polar, notice what happened. So the entire DNA molecule is swimming around in the solvent, in water, inside the nucleus of the cell. And water is a polar molecule. So what that means is these bases which are predominantly non polar, will not once interact with that polar water solvent. And what this double helix structure ensures is that all these non polar bases are found inside the structure of the double helix and away from the polar water molecules.