Which is true regarding mRNA transcription and processing?Group of answer choicesThe 5’ AAUAAA 3’ sequence that directs the addition of the polyA tail is added to the mRNA strand by polyadenylation factors.A 7-methylguansoine cap is added to the 3’ end of an mRNA strand.During splicing, a linkage is formed between one end of the intron, and a base in the middle of the intron, forming a looped RNA.The sequences in the mRNA strand that direct the activity of the spliceosome are located in the intron and the exon.
Question
Which is true regarding mRNA transcription and processing?Group of answer choicesThe 5’ AAUAAA 3’ sequence that directs the addition of the polyA tail is added to the mRNA strand by polyadenylation factors.A 7-methylguansoine cap is added to the 3’ end of an mRNA strand.During splicing, a linkage is formed between one end of the intron, and a base in the middle of the intron, forming a looped RNA.The sequences in the mRNA strand that direct the activity of the spliceosome are located in the intron and the exon.
Solution
The correct statement regarding mRNA transcription and processing is: "During splicing, a linkage is formed between one end of the intron, and a base in the middle of the intron, forming a looped RNA."
Here's why:
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The 5’ AAUAAA 3’ sequence that directs the addition of the polyA tail is not added to the mRNA strand by polyadenylation factors. Instead, this sequence is a signal in the pre-mRNA for where the polyA tail should be added by polyadenylation factors.
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A 7-methylguanosine cap is not added to the 3’ end of an mRNA strand. It is added to the 5' end of the mRNA strand. This cap is important for stability of the mRNA and for initiation of protein synthesis.
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During splicing, a linkage is indeed formed between one end of the intron, and a base in the middle of the intron, forming a looped RNA. This is known as a lariat structure.
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The sequences in the mRNA strand that direct the activity of the spliceosome are not located in both the intron and the exon. They are located in the intron only. These sequences are known as splice sites.
Similar Questions
In what way(s) can mRNAs be processed?Group of answer choicesBy removing the introns (the noncoding regions) of the mRNAsBy splicing the exons (the coding regions) of the mRNAs in different waysAll of the aboveBy adding caps and tails to the ends of the mRNAs
Which is not part of the post-transcriptional modifications?*1 pointadding a 5' capadding a poly-A tailcutting out the exonscutting out the introns
Which one of the following is true about splicing?Group of answer choicesIn prokaryotes, splicing repressors prevent the recognition of a 3’ splice junction.Splicing activators are proteins with RNA binding activityDifferential splicing means that proteins can be produced with their domains in different orders.In eukaryotes, all cells produce one splicing pattern for a particular gene.
What is the main event during mRNA splicing? Addition of new exons to the mature mRNA molecule Addition of new introns to the mature mRNA molecule Removal of all exons from the pre-mRNA molecule Removal of exons and add introns from the pre-mRNA molecule Removal of introns and ligation of the exon of the pre-mRNA molecule
A large complex made up of proteins and RNA molecules that removes introns from mRNA.Group of answer choicestranscription initiation complexspliceosomeribozymesRNA polymerasepolyribosomeaminoacyl-tRNA synthetasetranscription factor
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