Those tails are called hydrophobic. You can note the etymology: hydro= water, phobi = fear, aversion, dislike.
Phospholipds' tail is a long non polar chain, made of Carbon and Hydorgens, that rejects water (a polar solvent) and is attracted to non-polar compounds (oil for example). That is why that tails can atract dirt.
You just throw them on the pan with the flame all the way up it will be done in a second !
I think it's DNA forms a double helix and RNA consists a single strand.
I may be wrong...
