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- 4. Different populations of mouse L-cells that lack cadherins were transfected with either E- cadherin or P-cadherin. If cells expressing E-cad are mixed with those expressing P-cad, they segregate into distinct balls of cells (A in figure). However, if cells expressing different levels of the same cadherin are mixed, they form a single ball, with the high expressing cells in the center B in the figure). (A) E-cadherin SORTING OUT P-cadherin (B) low P-cadherin SORTING OUT high P-cadherin Why do the cells expressing different levels of cadherin segregate as in (B) in the figure, and why not into two separate balls, or one ball with a different organization (randomly mixed, or high expressors on the outside)?3). Consider the four mutations (i-iv) described below: i. One of the mutations causing cystic fibrosis in humans is a deletion of three nucleotides that eliminates a phenylalanine at position 508 of the CFTR protein (D508). Normally, CFTR protein is localized to the plasma membrane, where it functions as a chloride ion channel. D508 CFTR is misfolded and all of it is degraded without ever reaching the cell surface. ii. The yeast transcription factor Gal4p contains a DNA-binding domain and a transcriptional activation domain. An allele with a deletion the gene portion encoding the activation domain encodes a truncated Gal4p containing only the DNA-binding domain. It binds to Gal4p target genes at appropriate binding sites in their upstream regulatory regions, but does not activate their transcription. In cells with both wild type and mutant forms of Gal4p, the truncated Gal4p binds more efficiently to target DNA sequences than wild type. iii. Mutations in the acid maltase gene in…23. gene amplification results in larger amounts of gene products true or false
- 1. Using the data available describe the phenotype that you observe when each of these three genes is knocked down using RNAi. Remember to compare the worms on control RNAi plates with worms on each of the RNAi knockdown plates. In each case state how do these phenotypes relate to the function of the gene. (gene name for F27C1.8 is dpy-5,for T19E7.2 is skn-1) 2. Describe further experiments that you could do that would confirm your findings.32. A 23-year-old man comes to the physician because of a 1-month history of weakness and muscle pain after vigorous exercise. His mother, sister, and grandmother have a similar condition; however, his father's sister and her children are unaffected. A muscle biopsy specimen shows ragged red fibers. This condition most likely results from a mutation in a gene located in which of the following labeled structures in the photomicrograph? 00 O O A) B) E) B A E D C ARZidovudine (AZT) is a drug used to treat patients with AIDS. AZT works by blocking the reverse-transcriptase enzyme used by the human immunodeficiency virus (HIV), the causative agent of AIDS. Do you expect that AZT would have any effect on transposable elements? If so, what type of transposable elements would be affected, and what would be the most likely effect?
- Give 4 examples of transcription factors / non-structural proteins you have learned in this course? Identify the most commonly used technique for diagnosing COVID-19? And the clinical sample for each technique. …….…… virus can cause encephalitis, cancer, sexually transmitted disease, infect external genitalia, mucosal surfaces, gladiatorum, and/or other diseases. How can the infection with this virus be avoided? Suggest two ways of prevention or to destroy the virus.1. "Interferons (IFNs)‐α and ‐β are expressed in response to a virus infection and are released from the cell in which they are produced. IFNs induce an antiviral state in other neighboring cells. a. Which cellular process is inactivated when IFN‐treated cells are infected with a virus? b. One arm of the IFN‐induced antiviral state is the synthesis of 2′,5′‐oligoA in response to viral infection. In one sentence or a simple diagram, what is the effect of this on the cell? c. Another arm of the IFN‐induced antiviral state is activation of the protein kinase in response to viral infection. In one sentence or a simple diagram, what is the effect of this on the cell? d. All cells contain the genes for IFNs. IFN synthesis is stimulated by virus infection. Would you expect a cell that has been treated with IFN to synthesize IFN in response to a viral infection? Explain your answer."1. Using the data available Using the data available on Moodle describe the phenotype that you observe when each of these three genes is knocked down using RNAi. Remember to compare the worms on control RNAi plates with worms on each of the RNAi knockdown plates. In each case state how do these phenotypes relate to the function of the gene. describe the phenotype that you observe when each of these three genes is knocked down using RNAi. Remember to compare the worms on control RNAi plates with worms on each of the RNAi knockdown plates. In each case state how do these phenotypes relate to the function of the gene. 2. Describe further experiments that you could do that would confirm your findings.
- 2.) What types of behaviours or environmental circumstances can lead to changes in an individual’s epigenome? Explain.1. A strain of E. coli is genetically engineered in which the lacZ and lacY removed and replaced with a gene encoding a fluorescent protein. In addition, scientist produced a partial diploid E. coli strain, i.e. bacteria that have one full copy of the lac operon in their chromosome plus another copy of the lac operon in a plasmid. The modified bacteria have the follow genetic components: genes are One copy of the operon in which the protein product fluoresces green is inserted into the bacteria chromosome One copy of the operon in which the protein product fluoresces red is inserted into a plasmid. Both copies of the lac operon carry one copy of wild-type Promoter (lacP) and Operator (lacO) cis-acting DNA sequences. The modified bacteria have only one copy of the lacI repressor gene in their chromosomes. The lac operon in the plasmid doesn't have the lacI gene. If both fluorescent proteins are expressed, the cells fluoresce yellow and if neither of the fluorescent proteins is…4. Shown here is a regulation of a gene a) Is this a prokaryotic or eukaryotic gene? Explain in short b) Which of proteins A, B, or C is likely to have a DNA binding domain? c) Which of proteins A, B, or C is likely to have a transactivation domain? d) What would happen if the majority of DNA between the enhancer and site of RNA pol binding was deleted? RNA Polymerase II- Enhancer B DNA Gene X Expression of Gene X .5' 3'