Which of the following are the post-transcriptional events in a eukaryotic cell? Choose the correct answer from the options given below :
- B, C, E only
- C, D, E only
- A, B, C only
- B, C, D only
Answer
(4) B, C, D only
Solution
In eukaryotes the primary transcript (hnRNA) is processed in the nucleus:
B. Splicing – introns are removed and exons are joined.
C. Capping – methyl guanosine triphosphate is added at the 5' end.
D. Tailing – adenylate residues (200–300) are added at the 3' end.
A is wrong because only the fully processed mRNA is transported to the cytoplasm, after splicing. E is not a processing step of hnRNA.
Hence B, C and D are correct.
Answer: (4)