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the ribosome binding site interacts with which specific molecule in the ribosome
The Ribosome Binding Site base-pairs with an RNA molecule that forms part of the bacterial ribosome.
what molecule does the ribosome binding site interact with in eukaryotes
Mostly, ribosome binding sites refer to bacterial sequences, although internal ribosome entry sites have been described in mRNAs of eukaryotic cells or viruses that infect eukaryotes.
what do internal ribosome entry sites do
Internal Ribosome Entry Site are RNA structures that allow cap independent initiation of translation, and are able to initiate translation in the middle of a messenger RNA.

Question: when were the structures discovered
Self-contained rewrite: when were internal ribosome entry sites discovered