For 10 points, name these bonds that form between electronegative elements with lone pair electrons and the namesake element, which occurs in liquids like ammonia and water.
A weak form of this interaction can arise between a soft acid and soft base consisting of pi electrons. The low barrier form of this interaction occurs in enzymatic transition states where the donor and acceptor are closer than usual. Its presence in secondary protein structure allows for the formation of alpha helices and beta sheets. This type of interaction also links adjacent nuclear bases in DNA. For 10 points, name these bonds that form between electronegative elements with lone pair electrons and the namesake element, which occurs in liquids like ammonia and water.
A weak form of this interaction can arise between a soft acid and soft base consisting of pi electrons.
{hydrogen} bond