Concept explainers
Introduction:
The eukaryotic genes are composed of introns and exons. Splicing is the process of removal of introns from pre- mRNA. This results in the gene having only exons i.e. coding sequences. Exons are categorized into constitutive and alternative.
Alternative splicing is the splicing of mRNA exons that result in the formation of different polypeptides from the same gene. The pre-mRNAs can be spliced in different ways and that is explained by the researchers via alternative splicing by spliceosomes.
The structure and function of any protein relieson the sequence of the amino acid. The alternative splicing results in the formation of one or more polypeptides with different amino acid sequences. These alternative amino acid sequences have similar functions. The degree of splicing varies among the species. Alternative splicing allows the organism to carry fewer genes in its genome.
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Genetics: Analysis and Principles
- Differential RNA splicing may result in: a. A shift in the ratio of mRNA produced from two neighboring genes b. Inversion of exons in the mature mRNA c. Production of the same protein from two different genes d. Production of two different proteins with different properties from a single genearrow_forwarda. Why are cells different from each other? b. How is a gene organized? (promoter, cis regulatory regions, coding region…)arrow_forwardWhat is the purpose of alternative splicing a. Alternative spiicing allows a protein to be included by multiple genes b. Alternative spicing allows for mutations to accumulate that won't affect the expression of a gene c. Alternative splicing allows for multiple mRNAs to be produced to ensure that the single proteins the gene and codes will be translated. d.arrow_forward
- How would each of the following types of mutations affect proteinfunction or the amount of functional protein that is expressed froma gene?A. Nonsense mutationB. Missense mutationC. Up promoter mutationD. Mutation that affects splicingarrow_forwardA geneticist induces a mutation in eukaryote cells. The mutation results in an inability to form the poly(A) tail during processing of pre-mRNA. What does this mean for the mature mRNA and what will be the effect on these cells? Possible Answers: A. The mRNA will be spliced, but will not have a 5' cap. B. The mRNA will likely be degraded. C. The mRNA will not be cleaved. D. The mRNA will have too many Gs and Cs.arrow_forwardHow can Cas9 technology be used in gene therapy. A. Base editing can be used to repair DNA error B. All 3 answers C. Cas9 can be used to activate transcription of a gene D. Knocking out a gene if it’s gain a function mutation is the cause of the diseasearrow_forward
- If a mutation deletes the promoter in a eukrayotic gene, which of the following most accurately describes its consequence? A. There will be no mRNA or polypeptide made. B. The mRNA will be made but no polypeptide is made. C. The mRNA will not be processed properly. D. Nothing will happen. It is a silent mutation.arrow_forward1. Transcription: a)State the role of RNA polymerase in gene transcription.b. Explain why the DNA is not used directly for protein translation (i.e., why is mRNA used instead?).c. Explain what occurs when a gene’s promoter region is open for RNA polymerase binding.d. Explain what occurs when a gene’s promoter regions is blocked from binding RNA polymerase.e. Explain how two cells, such as liver cells and skin cells, can become specialized in structure and function despite containing the same genome.arrow_forwardthere is the statement: "Both stem cells and specialized cells have all the same genes. They differ in the regulation of those genes and express very different sets of genes ". Which one of the following explanations best accounts for this difference in stem cell and specialized cell gene expression? A. Stem cells and specialized cells have different activators and repressors that affect transcription B. Stem cells and specialized cells have different promoter sequences for their genes, thus affecting transcription C. Stem cells and specialized cells have different ribosomes that affect translation D. Stem cells and specialized cells use different start codons on mRNAs, thus affecting translationarrow_forward
- Alternate splicing: A. Reduces mRNA half-life by shortening poly(A) tails B. Disrupts histone arrangement for increased transcription C. Uses topoisomerase to complete its function D. Can produce 2 or more products from one genearrow_forwardGive two DIFFERENT examples of how the following can occur:a. A point mutation in an exon that is silent.b. A point mutation in an exon that is NOT silent.c. A point mutation in an intron that is NOT silent.d. A point mutation in a promoter that is NOT silent.arrow_forwardHow does reverse methylation affect gene expression? Select one: o a. The gene is turned off, but still expresses a protein product. b. The gene becomes transcriptionally silent. c. There is no effect on the gene. d. The gene is hyperactive resulting in a gain of function. e. The gene expresses the wrong protein. Clear my choice How do microRNAs regulate epigenetic mechanisms during development? Select one: o a. MicroRNAs function as gene repressors b. You only find microRNAS in epigenetic and cancer cells c. MicroRNAs function as gene activators d. MicroRNAS regulate methylation on the DNA sequences of embryos e. Researchers find that when microRNAs are present the effects of epigenetic modifications are 50% greater Clear my choicearrow_forward
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