Yup! The formation of the first Eukaryotic cell is a mystery. Eukaryotes have features of both bacteria and archea, yet doesn't have a clear origin in either of them. Here's a book that goes into more depth on the important stages of evolution: http://www.amazon.com/Major-Transitions-Evolution-Maynard-Sm...
On a tangent, my dismissiveness of creationists has only increased since reading The Major Transitions in Evolution. There are some really perplexing things in early evolution that we don't understand at all. And yet creationists like to talk about chimps and rocks.
On a tangent, my dismissiveness of creationists has only increased since reading The Major Transitions in Evolution. There are some really perplexing things in early evolution that we don't understand at all. And yet creationists like to talk about chimps and rocks.