Eukaryotic mRNA processing: the 5′ cap
Which feature is found in eukaryotic mRNA but not prokaryotic mRNA?
Answer B: explanation for every choice
A
Coupled transcription and translation is a prokaryotic feature, possible because they lack a nucleus.
B
Correct. Eukaryotic pre-mRNA gets a 5′ cap, a poly-A tail, and splicing in the nucleus.
C
Both prokaryotes and eukaryotes use AUG as the start codon.
D
All RNA is synthesized 5′→3′.
TakeawayEukaryotic processing: 5′ cap, poly-A tail, splicing.
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Reviewed 2026-11-05 by a medical student. Spot an error? Report it with question ID bb41.