Final answer:
Small nuclear ribonucleoproteins (snRNPs) are found in the nucleus of eukaryotic cells and play a critical role in the process of splicing.
Step-by-step explanation:
Small nuclear ribonucleoproteins (snRNPs) are found in the nucleus of eukaryotic cells. They play a critical role in the process of splicing, which is necessary to process messenger RNA (mRNA) molecules. SnRNPs bind to specific sites in an mRNA and direct a sequential series of cuts and ligations to remove introns and join exons, resulting in a mature mRNA molecule that can be used for protein synthesis.