Split genes
A)Are common in prokaryotes and eukaryotes
B)Only have exons initially transcribed to mRNA
C)Have introns located only at the beginning and end of a coding region
D)Use spliceosomes to excise introns and then join exons
E)All of the choices are correct

Question

Quizplus · Accepted Answer

Split genes are only found in eukaryotes and are characterized by the presence of noncoding regions called introns that interrupt coding regions called exons. In eukaryotes, RNA molecules are synthesized in the nucleus and need to undergo post-transcriptional modification to remove the introns and join the exons to produce a mature mRNA molecule. This process is carried out by spliceosomes, which are complexes composed of protein and RNA molecules that recognize and excise the introns and then join the exons. Therefore, option D is the correct choice as it describes the process of intron removal and exon joining by spliceosomes in split genes.

Split Genes