Q20 · Practice questionSimple familiar1 mark
QUESTION 20
A primary RNA transcript contains exon 1, intron 1, exon 2, intron 2 and exon 3, in that order. Which sequence remains after normal RNA splicing?
(A)
Intron 1–intron 2
(B)
Exon 1–exon 2–exon 3
(C)
Exon 1–intron 1–exon 3
(D)
Exon 2 only
WORKED SOLUTION
1 markAnswer B
Answer
B
Working
Splicing removes introns and joins the exons. A 5′ cap and poly-A tail are also added during processing of typical eukaryotic mRNA.
Marking criteria
- Select B. [1 mark]
Practice question aligned to the current QCAA syllabus; review the worked solution and marking criteria.
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