What do spliceosomes remove during the process of splicing?

During the process of splicing, spliceosomes are responsible for removing introns from the pre-mRNA transcript. Introns are non-coding regions that interrupt the coding sequences (exons) of a gene. Once the spliceosome recognizes the boundaries of an intron, it catalyzes a series of reactions that excise the intron and join the remaining exons together, forming a mature mRNA molecule. This refining process is crucial because it allows for the expression of genes as functional proteins, ensuring that only the necessary coding regions are included in the final mRNA that is translated into protein.

The key aspect of this process is that it enhances the efficiency and accuracy of gene expression by ensuring that the mRNA contains only the segments that will be used for protein synthesis. The roles of exons, coding sequences, and non-coding strands are not directly related to what spliceosomes do in splicing; rather, exons are retained after splicing, while coding sequences refer broadly to segments that can code for proteins, and non-coding strands relate to the roles of DNA and RNA configurations rather than splicing itself.