Haryana NEET Rank List 2025: Download PDF Rank List

RNA Processing MCQ - Practice Questions with Answers

Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET

Quick Facts

  • 28 Questions around this concept.

Solve by difficulty

Removal of introns and joining of exons in a defined order during transcription is called :

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

Which process eliminates the introns in eukaryotic transcription?

HIV possess                                                   

Concepts Covered - 1

Transcription in Eukaryotes & RNA Processing
  • RNA polymerase in eukaryotes requires the assistance from additional proteins called transcription factors, that first bind to the promoter region and then recruit the RNA polymerase.
  • The eukaryotes have three polymerases that are each made up of 10 subunits or more. 
  • In eukaryotes, the monocistronic structural genes have interrupted coding sequences – the genes in eukaryotes are split. 
  • The coding sequences or expressed sequences are defined as exons. 
  • Exons are said to be those sequences that appear in mature or processed RNA. 
  • The exons are interrupted by introns. 
  • Introns or intervening sequences do not appear in mature or processed RNA.
  • Therefore, the primary transcript of RNA contains both the exons and the introns and are non-functional. 
  • Hence, it is subjected to a process called splicing where the introns are removed and exons are joined in a defined order. 
  • The splicing of pre-mRNAs is conducted by complexes of proteins and RNA molecules called spliceosomes.
  • 5' Capping: 
    • While the pre-mRNA is still being synthesized, a 7-methylguanosine cap is added to the 5' end of the growing transcript by a phosphate linkage. 
    • This moiety (functional group) protects the nascent mRNA from degradation. 
    • In addition, factors involved in protein synthesis recognize the cap to help initiate translation by ribosomes.
  • 3' Poly-A Tail:
    • An enzyme called poly-A polymerase then adds a string of approximately 200 A residues, called the poly-A tail. 
    • This modification further protects the pre-mRNA from degradation and signals the export of the cellular factors that the transcript needs to the cytoplasm.

Study it with Videos

Transcription in Eukaryotes & RNA Processing

"Stay in the loop. Receive exam news, study resources, and expert advice!"

Get Answer to all your questions

Back to top