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NEET 2025, Biology Q76: Transcription and Translation

NEET2025Biology
Q.

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 :

  1. A

    C, D, E only

  2. B

    A, B, C only

  3. C

    B, C, D only

  4. D

    B, C, E only

Solution

The primary transcript (hnRNA) is processed in 3 steps:

  • 5' capping with a methyl-G cap → C
  • 3' tailing with adenine residues (poly-A tail) → D
  • Splicing: removal of introns and joining of exons → B

Transport of pre-mRNA prior to splicing (A) actually occurs as part of transcription — it is not a post-transcriptional event. Base pairing of two complementary RNAs (E) describes RNAi, not normal mRNA processing.

Post-transcriptional events: B, C and D.

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