Which one of the following statements about RNA processing is TRUE?
A) Exons are cut out before mRNA leaves the nucleus.
B) Ribozymes may function in RNA splicing.
C) RNA splicing can be catalyzed by tRNA.
D) A primary transcript is often much shorter than the final RNA molecule that leaves the nucleus.

Question

Quizplus · Accepted Answer

Ribozymes are RNA molecules that can catalyze chemical reactions, including RNA splicing. During splicing, introns (non-coding regions) are removed and the remaining exons (coding regions) are joined together to form mature mRNA. This processing occurs in the nucleus before mRNA leaves to be translated into protein. The primary transcript is typically longer than the final mRNA molecule because it includes both introns and exons, which are removed during processing. tRNA is involved in translation, not RNA splicing.

Which One of the Following Statements About RNA Processing Is