So let's take a look at the following diagram that basically describes a portion of our double helix. So this is the deoxyribo sugar, and for simplification purposes, I've omitted the hydroxyl group. So no hydroxyl groups are found on these sugar molecules. So we have the sugar that is attached to our phosphate. And the sugar and phosphate is basically on the outside of that DNA. So this is the outside portion of the DNA that interacts with the solvent.