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The half-life of an mRNA molecule is primarily or predominan

The half-life of an mRNA molecule is primarily or predominantly dependent on which of the fol… Show more; ; ; The half-life of an mRNA molecule is primarily or predominantly dependent on which of the folloiwng transcript structures? a.poly-A tail b.the 5′-cap c.5′-UTR d.the coding region 2-Phosphorylation of eIF2: a.prolongs elongation b.has no effect on translation c.enhances translation d.inhibits translation 3-The presence of an Iron Response Element affects translation of every mRNA transcript. True False 4-Phosphorylation of eIF4E: a.inhibits translation b.activates iron response elements c.enhances translation d.has no effect on translation 5-The 7-methyl guanosine cap and the poly-A tail of a mRNA are both involved in or required for? a.alternative splicing b.miRNA activity c.protecting an mRNA from exonuclease attack d.protecting an mRNA from endonuclease attack 6-A process called alternative splicing of mRNA transcripts can produce mRNAs with ________ from the same gene. a.one different exon b.more or fewer exons c.completely different exons d.all of the above 7-Messenger RNAs have varying half-lives in the cytoplasm, and those differences are usually due to differences in the sequences near the 5′-end of the mRNA. True False 8-To function as a repressor-binding site, the iron response element (IRE) must be in the 5-UTR region of the ferritin mRNA. This suggests that regulatory protein binding to this IRE: a.blocks the translation start site b.promotes circularization of the mRNA template c.inhibits the translocation step of translation d.regulates mRNA degradation 9-Phosphorylation of elongation factors 2 and 2B: a.blocks the addition of a terminal phosphate to the bound GDP b.allows them to initiate translation c.blocs their exchange of bound GDP for GTP d.allows them to be recycled back to the ribosome 10-Small nucleotide sequences such as siRNA or miRNA are involved in BOTH post-transcriptional and translational regulation of gene expression. True False

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