Question

Removal of introns and joining the exons in a defined order in a transcription unit is called

• A. splicing
• B. capping
• C. transformation
• D. tailing

Answer 1

The correct option is A

splicing

The correct option is A.

Explanation of correct option:

1. Splicing refers to the process by which the non-coding regions of genes (introns) are removed and the coding regions (exons) are joined to form mature mRNA.
2. The joining is performed in a defined order.

Explanation of incorrect options:

Option B:

Capping is a procedure of adding methyl guanosine triphosphate (an unusual nucleotide) to the 5’ end of the mRNA.

Option C:

The transfer and incorporation of foreign DNA into the genome of host is known as transformation.

Option D:

Tailing is process of addition of a poly (A) tail to mRNA at its 3' end.

Final answer: Removal of introns and joining the exons in a defined order in a transcription unit is called splicing.