AP Biologyeasymcq1 pt
In eukaryotes, which RNA processing steps occur before mRNA leaves the nucleus?
A.5′ cap addition, poly-A tail addition, and splicing
B.Only translation
C.Only DNA replication
D.No processing at all
Explanation
Core Concept
Typical RNA polymerase II transcripts receive a 5′ cap, are cleaved and polyadenylated at the 3′ end, and have introns removed when present before export and translation. These processes improve transcript stability, export, and translation. They are not universal requirements for every eukaryotic mRNA—for example, some genes are intronless and replication-dependent histone mRNAs use a specialized non-poly(A) 3′ end.
Correct Answer
A5′ cap addition, poly-A tail addition, and splicing
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