2025 Molecular Basis of InheritanceTranscription in Eukaryotes Easy Question 2 of 8 in Transcription in Eukaryotes

Which of the following are the post-transcriptional events in an eukaryotic cell?
A. Transport of pre-mRNA to cytoplasm prior to splicing.
B. Removal of introns and joining of exons.
C. Addition of methyl group at 5' end of hnRNA.
D. Addition of adenine residues at 3' end of hnRNA.
E. Base pairing of two complementary RNAs.
Choose the correct answer from the options given below:

A A, B, C only
B B, C, D only
C B, C, E only
D C, D, E only

The answer is B.

Solution

Post-transcriptional modifications of hnRNA include splicing (B), 5'-capping (C), and 3'-polyadenylation (D).

In eukaryotic nucleus, newly synthesized hnRNA undergoes: (B) Splicing (introns removed, exons joined), (C) Capping (7-methylguanosine added to 5' end), and (D) Tailing (200-300 adenylate residues added at 3' end). Pre-mRNA is not transported to cytoplasm before splicing, so only B, C, and D are correct.

Concept Post-Transcriptional Modifications

Transcription in Eukaryotes in past papers

8 questions from this chapter have appeared across 8 exam years.