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A spliceosome is a large and complex molecular machine found primarily within the splicing speckles of the cell nucleus of eukaryotic cells. The spliceosome is assembled from snRNAs and protein complexes. The spliceosome removes introns from a transcribed pre-mRNA, a kind of primary transcript.This process is generally referred to as splicing.he RNA component of the small nuclear ribonucleic protein or snRNP (pronounced snurp) is rich in uridine (the nucleoside analog of the uracil nucleotide). The canonical assembly of the spliceosome occurs anew on each hnRNA (pre-mRNA).
The ribosome is a complex of over 50 proteins plus its own complement of RNA, often denoted rRNA. There are free ribosomes that are suspended in the cytoplasm of the cell, but many of them are attached to the rough endoplasmic reticulum associated with the nuclear envelope of the cell. The ribosomes in prokaryotic cells are free floating structures, there being no nuclei in such cells. If genomic DNA is the cell's planning authority, then the ribosome is its factory, churning out the proteins of life.