Question

With regard to mature mRNA in eukaryotes:

• A. introns appear but exons do not appear in the mature RNA
• B. exons and introns do not appear in the mature RNA
• C. both exons and introns appear in the mature RNA
• D. exons appear but introns do not appear in the mature RNA

Answer 1

The correct option is D exons appear but introns do not appear in the mature RNA

Introns:

Introns are the non-coding sequence in a RNA transcript as this region of the gene does not code for a protein.


Exons:

Exons are coding regions in a RNA transcript as this region of gene codes for a protein.


Splicing:

Primary transcript of RNA (hnRNA) in eukaryotes undergo splicing in which introns are removed and exons are joined together to form mature mRNA. This mRNA is used in the translation process for the synthesis of proteins.




Mature mRNA:

Mature mRNA possess exons, adenylate residues (200-300) at 3'-end called the poly A tail and methyl guanosine triphosphate (cap) at the 5’end.

Final answer: b. exons appear but introns do not appear in the mature RNA