Use the following information to answer the next few questions.
A transfer RNA (#1) attached to the amino acid lysine enters the ribosome. The lysine binds to the growing polypeptide on the other tRNA (#2) in the ribosome already.
-Which of the following is not true of RNA processing?
A) Exons are cut out before mRNA leaves the nucleus.
B) Nucleotides may be added at both ends of the RNA.
C) Ribozymes may function in RNA splicing.
D) RNA splicing can be catalyzed by spliceosomes.
E) A primary transcript is often much longer than the final RNA molecule that leaves the nucleus.

Question

Quizplus · Accepted Answer

Exons are not cut out before mRNA leaves the nucleus. Exons are the coding regions of DNA that are spliced together to form mature mRNA before it leaves the nucleus. Introns, the non-coding regions of DNA, are cut out during RNA processing.

Use the Following Information to Answer the Next Few Questions