I would compare a ribosome to a stove. Since heat could be Trna, that is transfering the amino acid to protein to build a poly peptide change. Trna is transfering heat to the amino acid, which is the "food," and it is being cook or prepare by the stove (ribosome), who is generating the finish product.
Since the nucleolus is inside the nucleus, and the nuclueus is the main brain power. Nucleus could be the telephone, since its commuciating messages to the other system, and nucleolus is the phone it self.