So we can say hydrogen bonding and this is also hydrogen bonding or simply age bonding. Okay? So a base on one DNA strand interacts with via hydrogen bonds with a complementary base on the other DNA molecule. And so when these single strand molecules approach one another, these hydrogen bonds that are formed, that is a stabilizing effect. Now what about the second type of interaction, the London Dispersion forces. So notice that these base pairs are essentially parallel with respect to one another.