Multiple Choice
Splicing of different exons together from the same mRNA molecule can result in which of the following?
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10. Transcription
RNA Modification and Processing
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A sequence of mRNA that is removed during processing is a(n):
A
poly-A tail
B
exon
C
intron
D
promoter
Verified step by step guidance1
Understand the process of mRNA processing: After transcription, the initial mRNA transcript (pre-mRNA) contains both coding and non-coding regions.
Identify the non-coding regions in the pre-mRNA: These are called introns, which are sequences that do not code for proteins and need to be removed.
Recognize the coding regions that remain in the mature mRNA: These are called exons, which are spliced together after introns are removed.
Recall that the poly-A tail is a string of adenine nucleotides added to the 3' end of the mRNA for stability, not removed during processing.
Know that the promoter is a DNA sequence where RNA polymerase binds to initiate transcription, not part of the mRNA sequence.
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