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  • Which of the following are the posttranscriptional events in an eukaryotic cell?

Q.167) Which of the following are the posttranscriptional 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′5^{\prime}5′ end of hnRNA.
D. Addition of adenine residues at 3' end of hnRNA.
E. Base pairing of two complementary RNAs.

 

A)  C, D, E only

B) A, B, C only

C) B, C, D only

D) B, C, E only

 

Answers (1)

best_answer

Q.167) In eukaryotic cells, the initial RNA transcript (hnRNA) undergoes several posttranscriptional modifications before becoming functional mRNA. These include:

  • Removal of introns and joining of exons (splicing) (B)

  • Addition of a methylated cap at the 5′5'5′ end (C)

  • Addition of a poly-A tail (adenine residues) at the 3′3'3′ end (D)

Statement A is incorrect because splicing occurs in the nucleus before the RNA is transported to the cytoplasm.
Statement E is unrelated to typical mRNA processing — it refers to RNA-RNA interactions like in RNA interference.

Hence, the correct answer is option 3) B, C, D only

 

Posted by

Shreya Pandey

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