In eukaryotic gene expression, which post-transcriptional modification involves removing non-coding sequences and joining exons together?
Answer and explanation
Correct answer: D. RNA Splicing catalyzed by spliceosomes
- Step 1: Pre-mRNA contains alternating coding exons and non-coding introns. Step 2. Spliceosomes (composed of snRNPs) excise introns and ligate exons to form mature mRNA, a process called RNA splicing. Answer: RNA Splicing catalyzed by spliceosomes. Why not the others: 5' capping adds 7-methylguanosine at the 5' end; polyadenylation adds adenine nucleotides at the 3' end; RNA editing alters base sequences directly.
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