Which is true of alternative splicing?
The correct answer is choice b. One strand of DNA can produce different mRNAs.
What are the effects of alternative RNA splicing?
The consequences of an alternative splicing are the deletion or the insertion of a nucleic acid sequence that might modify the protein sequence encoded by the gene.
Does alternative splicing occur in prokaryotes?
Another major difference in splicing between prokaryotes and eukaryotes is that splicing in prokaryotes does not involve a spliceosome. The frequency of RNA splicing depends on the complexity of gene structures of genomes in particular species. Therefore, most genes in humans undergo splicing, to generate mature mRNA.
Is alternative splicing post translational?
Reading: RNA Post-Translational Modification Some transcripts can undergo alternative splicing. This regulated process makes different mRNAs and proteins from the same initial RNA transcript. Some mRNAs are targeted by small regulatory RNAs, including miRNAs, which can cause mRNA degradation or block translation.
What is an example of post translational control?
While there are many diverse chemical modifications of amino acids, three common examples are phosphorylation, glycosylation, and ubiquitination. Phosphorylation involves the addition of phosphate to an amino acid side chain, usually to the side chain hydroxyl (-OH) of serine, threonine, or tyrosine.
What are the three steps of post-transcriptional modification?
This process includes three major steps that significantly modify the chemical structure of the RNA molecule: the addition of a 5′ cap, the addition of a 3′ polyadenylated tail, and RNA splicing.
What is meant by post-transcriptional control?
In Summary: Post-TransCRIPTIONAL Control of Gene Expression This involves the removal of introns that do not code for protein. Spliceosomes bind to the signals that mark the exon/intron border to remove the introns and ligate the exons together. Once this occurs, the RNA is mature and can be translated.
What is an example of post-transcriptional regulation?
Later stages of gene expression can also be regulated, including: RNA processing, such as splicing, capping, and poly-A tail addition. Messenger RNA (mRNA) translation and lifetime in the cytosol. Protein modifications, such as addition of chemical groups.
Which of the following is an example of post-transcriptional?
The removal of introns and alternative splicing of exons is an example of post-transcriptional control of gene expression.
How do introns regulate genes?
In many eukaryotes, including mammals, plants, yeast, and insects, introns can increase gene expression without functioning as a binding site for transcription factors. Introns can increase transcript levels by affecting the rate of transcription, nuclear export, and transcript stability.
How are introns recognized?
Nuclear pre-mRNA introns (spliceosomal introns) are characterized by specific intron sequences located at the boundaries between introns and exons. These sequences are recognized by spliceosomal RNA molecules when the splicing reactions are initiated.