Question

Statement A: The primary transcript produced in eukaryotes is translated without undergoing any modification or processing.
Statement B: The hnRNA in humans has exons and introns.

• A. Both the statements A and B are correct.
• B. Both the statements A and B are wrong.
• C. Statement B is correct and statement A is wrong.
• D. Statement A is correct and statement B is wrong.

Answer 1

The correct option is C Statement B is correct and statement A is wrong.

• The primary transcript which is produced in the prokaryotes do not contain the introns and exons. They are translated directly after transcription. There is no modification or translation stage.
• The eukaryotes produce the mRNA which has introns and exons. Therefore they undergo a process of splicing for removing introns and joining exons in the proper order and finally, mature mRNA is formed. So, statement A is wrong.
• The premature form of mRNA which is produced in humans is called as heterogenous RNA (hnRNA).
• This RNA molecule undergoes modification like the splicing in which the introns are removed and the exons are ligated. There are other modifications like capping and tailing. So, statement B is correct.

Thus, the correct answer is option C.