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- Which of the following effectively describes the situation of someone with an inherited predisposition to cancer such as familial adenomatous polyposis or BRCA-associated familial breast cancer? Choose all that apply a) If they get malignant cancer, somatic mutations will not have been a factor b) Their cancer will most likely arise in their germ cells, not their somatic cells c) None of the answers effectively describes the situation d) Every cell of their body contains a gain-of-function allele of an oncogene e) Most cells in their body contain multiple cancer-causing mutations f) Every cell of their body contains a defective, loss-of-function allele of a tumor suppressor geneWhich of the following is true of tumor suppressor genes? Group of answer choices a) If this gene is overactive, it becomes an oncogene b) If one of the alleles is mutated, there is usually little effect. Two inactivating mutations are usually required for loss of function (recessive mutation). c) If one copy is lost, the gene no longer functions (dominant mutation) d) Tumor suppressors genes usually cause mitosis or cell growth e) Tumor suppressor genes decrease apoptosisWhy would the failure of the p53 tumor supressor gene be more likely to cause cancer in a seventy year old person compared to a ten year old person? Group of answer choices A) The seventy year old is more likely to have pre-existing failures in cell cycle control B) cells divide more rapidly as people get older C) there are fewer mutations in genes controlling the cell cycle in older people D)the p53 gene never works well in old people
- Which of the following statements correctly describes a characteristic of tumor-suppressor gene? a) they are frequently overexpressed in cancerous cells. b) they are cancer-causing genes introduced into cells by viruses. c) they encode proteins that help prevent uncontrolled cell growth. d) they often encode proteins that stimulate the cell cycle.In the pathway below, normal signalling driving cell division requires a mitogen (ligand), an RTK, Ras and proteins X and Y. Which of the following statements is true about the genes that encode the mitogen and Ras in healthy cells? mitogen active Ras protein CYTOSOL GTP active signaling protein Y active receptor active signaling protein X tyrosine kinase CELL DIVISONWhy is p53 considered a tumor suppressor protein? Question 12 options: a) Because p53 normally detects breaks in DNA. b) Because p53 normally causes progression from G1 to S phase to halt until damaged DNA is fully repaired. c) Because p53 normally repairs breaks in DNA. d) Because p53 normally stimulates transcription of Repair Polymerase. e) Because p53 normally reduces the mutation rate of DNA polymerase.
- D) The level of carbon dioxide increases with the level of available oxygen. 60) The TPS3 gene provides instructions for making a protein called tumor protein p53. Known as the guardlan of the genome, this protein acts as a tumor suppressor, which means that it regulates cell division by keeping cells from growing and dividing t0o fast or in an uncontrolled way. The p53 protein is located in the nucleus of cells throughout the body, where it attaches directly to DNA and plays a critical role in determining whether the DNA will be repaired or the damaged cell will self- destruct (undergo apoptosis). If the DNA can be repaired, p53 activates other genes to fix the damage. If the DNA cannot be repaired, this protein prevents the cell from dividing and signals it to undergo apoptosis. Suppose chromosomes in a skin cell are damaged by ultraviolet radiation. If the damaged genes do not affect p53, which choice correctly predict if the cell will become cancerous and why? No, the cell will not…1. a)Proteins that stimulate/promote progression through the cell cycle are encoded by (oncogenes or tumor suppressor genes). Boldface one. b)Proteins that inhibit progression through the cell cycle are encoded by (oncogenes or tumor suppressor genes). Boldface one. c)What is the difference between a proto-oncogene and an oncogene? d)To cause cancer, proto-oncogenes require (1 or 2)allele(s) to be mutated and therefore are considered (dominant or recessive). The mutation results in a (loss or gain) of function. For each underlined pair, boldface one. e)To cause cancer, tumor suppressor genes require (1 or 2)allele(s) to be mutated and therefore are considered (dominant or recessive). The mutation results in a (loss or gain) of function. For each underlined pair, boldface one.D) The level of carbon dioxide increases with the level of available oxygen. 60) The TP53 gene provides instructions for making a protein called tumor protein p53. Known as the guardian of the genome, this protein acts as a tumor suppressor, which means that it regulates cell division by keeping cells from growing and dividing too fast or in an uncontrolled way. The p53 protein is located in the nucleus of cells throughout the body, where it attaches directly to DNA and plays a critical role in determining whether the DNA will be repaired or the damaged cell will self- destruct (undergo apoptosis). If the DNA can be repaired, p53 activates other genes to fix the damage. If the DNA cannot be repaired, this protein prevents the cell from dividing and signals it to undergo apoptosis. eg Suppose chromosomes in a skin cell are damaged by ultraviolet radiation. If the damaged genes do not affect p53, which choice correctly predict if the cell will become cancerous and why? No, the cell will…
- Which of the following is an enabling characteristic for cancer that can increase the likelihood of both passenger and driver mutations? a) Increased angiogenesis O b) Tumor-promoting inflammation O c) Avoiding immune destruction O d) Genome instability acerPart A and B A. What below would be likely to lead to cancer development? A) Overexpression of a cell cycle checkpoint inhibitor B) Loss of expression of a growth factor that promotes cell cycle entry C) Overexpression of a receptor tyrosine kinase that promotes cell cycle entry D) Overexpression of a DNA damage repair enzyme E) Loss of expression of a regulatory transcription factor that activates transcription of a cyclin B. Taxols inhibit the proper function of microtubules and are frequently used as chemotherapy drugs. What is the function of microtubules during the cell cycle? A) They promote the G1 to S checkpoint B) They normally inhibit M phase from being completed C) They form the mitotic spindle E) They mediate DNA replication F) They form the cleavage furrow during cytokinesisCharacterize the differences between tumor cells and normal cells in terms of the following properties. In cancer cells, how might each of these properties contribute to tumor progression? a) contact inhibition b) autocrine stimulation c) apoptosis d) senescence due to telomere shortening e) genomic stability f) angiogenises g) metastasis