Which type of RNA is involved in splicing introns from pre-mRNA in eukaryotes?

Small nuclear RNA (snRNA) plays a crucial role in the process of splicing introns from pre-mRNA in eukaryotic cells. These molecules are integral to the formation and function of the spliceosome, a complex that carries out the splicing process. The spliceosome recognizes specific sequences at the intron-exon boundaries, facilitating the removal of introns and the joining of exons, thus producing a mature mRNA molecule that can be translated into proteins.

In this context, the other types of RNA serve different functions. Micro RNA (miRNA) is primarily involved in post-transcriptional regulation of gene expression by inhibiting the translation of target mRNAs. Transfer RNA (tRNA) is essential for the translation process, as it transports amino acids to the ribosome, matching them with the codons on the mRNA strand. Small interfering RNA (siRNA) is involved in the RNA interference pathway, which regulates the expression of genes and can lead to the degradation of mRNA. Thus, while all these RNA types are essential in different biological processes, it is the small nuclear RNA that specifically facilitates splicing in eukaryotic pre-mRNA.