Which one of the following statements about RNA processing is correct?
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 function as enzymes and catalyze reactions such as RNA splicing. Exons are not cut out until after RNA splicing has occurred. tRNA is involved in protein synthesis, not RNA splicing. A primary transcript is typically longer than the final RNA molecule due to RNA processing steps such as splicing and the addition of a protective cap and tail.

Which One of the Following Statements About RNA Processing Is