Final answer:
IRE1 splices out introns during mRNA processing to enable efficient protein translation.
Step-by-step explanation:
In eukaryotes, IRE1 splices out introns from mRNA during processing. The splicing of introns is a crucial step in post-transcriptional modification, which involves removing the non-protein-coding intervening sequences (introns) from the transcribed RNA molecule to generate a translatable mRNA molecule. By splicing out introns, IRE1 ensures that only the protein-coding exons are retained in the mRNA, allowing for efficient translation of the genetic information into proteins.