Multiple Choice
When does mRNA processing occur in eukaryotic cells?
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10. Transcription
RNA Modification and Processing
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During RNA processing, a(n) _____ is added to the 3' end of the RNA.
A
poly-A tail
B
exon
C
5' cap
D
intron
Verified step by step guidance1
Understand that RNA processing involves several modifications to the primary RNA transcript before it becomes mature mRNA.
Recall that the 5' end of the RNA receives a 5' cap, which is a modified guanine nucleotide added to protect the RNA and assist in ribosome binding.
Recognize that introns are non-coding sequences that are removed during RNA splicing, while exons are the coding sequences that remain.
Identify that the 3' end of the RNA undergoes a specific modification where a string of adenine nucleotides is added; this is known as the poly-A tail.
Conclude that the poly-A tail is added to the 3' end of the RNA to increase stability and aid in export from the nucleus.
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