Question

The following figure represents the transcription process in eukaryotes. Identify the parts A and B and choose the correct option.
[0.7 mark]

• A.

  A	B
  Intron	Unusual nucleotide

• B.

  A	B
  Exon	Poly A tail

• C.

  A	B
  Intron	Poly A tail

• D.

  A	B
  Exon	Methyl guanosine triphosphate

Answer 1

The correct option is C

A	B
Intron	Poly A tail

The given figure is representing the process of transcription and post-transcriptional modification of primary transcript. During this process, an unusual nucleotide (methyl guanosine triphosphate) is added to the 5′ end of hnRNA and adenylate residues are added at 3′ end and thus called poly A tail (B). In the process of splicing, introns are removed and exons (A) are joined in a defined order.