Regarding posttranscriptional processing of mRNA molecules in eukaryotic cells, which of the following statements is correct?
A) A poly A sequence is added to the 5' end of the newly formed hnRNA.
B) Introns are nontranslated regions of hnRNA which are excised during processing.
C) The capping of hnRNA, unlike other processing events, occurs in the cytoplasm of cells.
D) Both A and B are correct.
E) Both B and C are correct.

Question

Quizplus · Accepted Answer

Choice B is the correct statement. Introns are noncoding regions of hnRNA that are excised during processing. Choice A is incorrect because a poly-A sequence is added to the 3' end of the newly formed hnRNA, not the 5' end. Choice C is also incorrect because the capping of hnRNA occurs in the nucleus during processing, not in the cytoplasm. Choice D and E are incorrect because only choice B is correct.

Regarding Posttranscriptional Processing of MRNA Molecules in Eukaryotic Cells, Which