Precursor mRNA is larger than the mRNA it forms.

Question

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Precursor mRNA (pre-mRNA) is the primary transcript of DNA that undergoes several post-transcriptional modifications, including splicing and polyadenylation, to form mature mRNA. Pre-mRNA contains introns, which are non-coding sequences, and exons, which are coding sequences that will be translated into proteins. The process of splicing removes introns and joins exons together to form mature mRNA, which is smaller than pre-mRNA because it lacks the non-coding introns. Therefore, pre-mRNA is larger than the mRNA it forms.

Precursor MRNA Is Larger Than the MRNA It Forms