Final answer:
The consensus sites required for splicing introns during mRNA processing are GU at the 5' end and AG at the 3' end.
Step-by-step explanation:
The consensus sites required for splicing introns during mRNA processing are GU at the 5' end and AG at the 3' end.
These specific nucleotides mark the beginning and end of each intron, ensuring their accurate and precise removal during splicing. The splicing process involves complexes of proteins and RNA molecules called spliceosomes.