Which answer correctly compares the primary transcript in the nucleus of a eukaryotic cell with the functional mRNA?

Question

the primary transcript is smaller than the mRNA
the primary transcript is larger than the mRNA
both the primary transcript and mRNA contain introns
the primary transcript is the same size as the mRNA

Answer 1

The correct answer is: the primary transcript is larger than the mRNA.

In eukaryotic cells, the primary transcript (pre-mRNA) includes both introns and exons. During the processing of the primary transcript, introns are removed, and exons are spliced together to form the functional mRNA. Therefore, the primary transcript is typically larger than the final mature mRNA.