The removal of sections of RNA, called introns, occur at which regulation step in eukaryotic cells?
The question and possible responses are:
The removal of sections of RNA, called introns, occur at which regulation step in eukaryotic cells? Responses chromatin remodeling chromatin remodeling -
A.) mRNA life span
B.) post-translation
C.) RNA processing
D.) Chromatin remodeling
The correct answer is C, RNA processing
The removal of introns in RNA occurs during a process called RNA splicing, which takes place in the nucleus of eukaryotic cells, specifically during the post-transcriptional regulation step.
To understand this process further, let's break it down into steps:
1. Transcription: During transcription, the DNA sequence is read by an enzyme called RNA polymerase, which creates a complementary RNA molecule known as pre-mRNA.
2. Pre-mRNA Processing: In eukaryotic cells, pre-mRNA undergoes several modifications before it can be translated into a protein. One of these modifications is RNA splicing.
3. RNA Splicing: This process involves the removal of introns, which are non-coding regions of the pre-mRNA, and joining together of exons, which are the coding regions.
4. Exon Junction Complex (EJC) Formation: After splicing, the exons are joined together to form a mature mRNA molecule. Along with this process, Exon Junction Complex (EJC) proteins are deposited around the spliced junctions.
5. Nuclear Export: The mature mRNA, along with EJC proteins, is transported out of the nucleus to the cytoplasm, where it can be further translated into a protein.
In summary, the removal of introns occurs during RNA splicing, which is a post-transcriptional regulation step in eukaryotic cells.