[marcosdumay]

Ribosomes are mostly RNA, and there is good evidence that they evolved from something that was purely RNA. The aminoacid transport and encoding mechanism is also basically composed of RNA, with some evidence that something like them would work without any of the protein parts.

Also, people have created RNA-only self replicating mechanisms that could quite well appear at random, with extremely low odds. Life probably comes from some structure with higher odds that we don't know about, but that's not a huge gap.