In genetics, the 'Spliceosome' is a large, complex molecular machine found within the nucleus of eukaryotic cells. Its primary function is to:
A. Translate mRNA into protein
B. Remove introns from pre-mRNA and join the exons together to form mature mRNA
C. Add the 5' cap and poly-A tail to mRNA
D. Synthesize mRNA from a DNA template
Answer: Option B
Solution (By JKSSB Mock Tests)
The spliceosome is a large, dynamic complex composed of five small nuclear ribonucleoproteins (snRNPs, pronounced 'snurps') and numerous other protein factors. It assembles on the pre-mRNA transcript in the nucleus. Its primary function is to catalyze the splicing of pre-mRNA: it precisely recognizes the splice sites at the boundaries of introns and exons, removes the non-coding intron sequences, and ligates (joins) the coding exons together to form a continuous, mature mRNA molecule that can be exported to the cytoplasm for translation.
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