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BotanyNEET 2025Transcription, genetic code, translation

Molecular Basis of Inheritance

Which of the following are the post-transcriptional events in a eukaryotic cell?

A. Transport of pre-mRNA to the cytoplasm prior to splicing.

B. Removal of introns and joining of exons.

C. Addition of a methyl group at the 5′ end of hnRNA.

D. Addition of adenine residues at the 3′ end of hnRNA.

E. Base pairing of two complementary RNAs.

Choose the correct answer from the options given below:

  1. A.A, B, C only
  2. B.B, C, D only✓
  3. C.B, C, E only
  4. D.C, D, E only

Solution

hnRNA is capped with a methyl-guanosine at the 5′ end (C), polyadenylated at the 3′ end (D), and spliced to remove introns and join exons (B) — all before it leaves the nucleus. So B, C and D.

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