Use this model of a eukaryotic primary transcript to answer the following question.
E = exon and I = intron
5′-UTR E1 I1 E2 I2 E3 I3 E4 UTR-3′
If the primary transcript is processed and transported to the cytosol, which of the following molecules best represents the mRNA that will be produced?
A) 5′-UTR I1 I2 I3 UTR-3′
B) 5′-E1 E2 E3 E4-3′
C) 5′-UTR E1 E2 E3 E4 UTR-3′
D) 5′-E1 I1 E2 I2 E3 I3 E4-3′

Question

Quizplus · Accepted Answer

During the processing of a eukaryotic primary transcript (pre-mRNA) to form mature mRNA, introns (I) are removed, and exons (E) are spliced together. The 5′ and 3′ untranslated regions (UTRs) are retained. Therefore, the mature mRNA will consist of the exons and UTRs, as represented in option C.

Use This Model of a Eukaryotic Primary Transcript to Answer