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Gene Expression
4. The diagram below represents regions around a gene encoding a mRNA. Exon I of the mRNA
contains the translation initiation AUG codon. Exon IV contains the UGA termination codon.
The letters A through E above the diagram refer to areas of the gene and/or the primary transcript
made from this gene.
A
B C
D
E
upstream
exoni
exonli-
exon in.
exon iv .
downstream
-75
-25 +1 AUG
UGA
a. What region of the primary transcript is removed by a spliceosome?
b. What region of the DNA contains the TATA box?
c. Where is the poly (A) tail added to the transcript?
d. Where is the 5′ cap added to the transcript?
e. Are UTRs part of exons?Science