In Pre-MRNA Processing,____

Question

In pre-mRNA processing,____.
A) exons are spliced out and used to produce ribosomal subunits
B) introns are spliced out and combined to form complete proteins
C) introns are spliced out and combined in the tRNA
D) exons are spliced out and the introns are combined in the mature mRNA
E) introns are spliced out and the exons are combined in the mature mRNA

Accepted Answer

In pre-mRNA processing, introns are spliced out and the exons are combined in the mature mRNA. This is called RNA splicing and is essential for the production of a functional protein from the pre-mRNA transcript. The introns, which do not code for proteins, are removed and the exons, which contain the actual protein-coding sequence, are joined together in the mature mRNA. This process is carried out by a large protein-RNA complex called the spliceosome.