Question

What would happen to water and DNA if we exchanged all hydrogen bonds with other permanent I pulled dipole forces DNA would become more stable DNA would break apart DNA would become more stable water would turn to ice DNA would become less stable water would boil at a lower temperature

Answer 1

Short answer: water would boil at a much lower temperature, and DNA would become less stable (it would denature / fall apart much more easily).

Why: hydrogen bonds are relatively strong and highly directional compared with ordinary permanent dipole–dipole interactions. In water the network of H‑bonds raises the melting/boiling points and gives liquid water its cohesion; replacing them with weaker, non‑directional dipole–dipole forces would dramatically weaken that network (think H2O versus H2S), so the liquid would evaporate at much lower temperatures. In DNA the H‑bonds between base pairs (A–T two bonds, G–C three bonds) are critical for specific base pairing and helix stability; replacing them with weaker dipole interactions would reduce pairing specificity and stability so the double helix would denature much more easily.