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- Why does a single mutation in a proto-oncogene, turning it into an oncogene potentially lead to a cancerous phenotype, while it takes two mutations in tumor suppressor genes to lead to a cancerous phenotype?Which of the following mutations is MOST likely to cause cancer? A) a mutation that causes a cyclin gene to be expressed at all times during the cell cycle B) a mutation that causes an oncogene to be turned off so that no protein is made C) a mutation that causes a Cdk gene to be turned off so that no protein is made D) a mutation that causes a tumor suppressor gene to be over-expressedWhat is the difference in an oncogene and tumor suppressor gene and how can each potentially lead to cancer?
- What is the difference between a proto-oncogene and a tumor suppressor gene? How can mutations in these genes lead to cancer?What is a tumor suppressor? What is an oncogene?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.
- Which of the following accurately compares tumor suppressor genes and proto-oncogenes? A. Both tumor suppressor and proto-oncogenes prevent the spread of cancer by targeting and destroying existing cancer cells. B. A person who has both tumor suppressor and proto-oncogenes will always develop cancer. C. Proto-oncogenes code for growth factors, while tumor suppressor genes inhibit cell division of damaged cells. D. When a proto-oncogene mutates, it becomes a tumor suppressor gene.Compare and contrast oncogenes and tumor suppressors. Contrast oncogenes and proto-oncogenes. Describe the types of mutations that convert proto-oncogenes into oncogenes. Summarize some functions of common oncogenes in cell survival and uncontrolled growth. Contrast tumor suppressors to oncogenes. Describe the types of mutations in tumor suppressors that are found in common cancers. Summarize the functions of common tumor suppressors in cell survival and cell growth.What is a primary function of tumor suppressor genes?
- Which of the following mutations will result in cancer? a. homozygous recessive mutation in a tumor-suppressor gene coding for a nonfunctional protein b. dominant mutation in a tumor-suppressor gene in which the normal protein product is overexpressed c. homozygous recessive mutation in which there is a deletion in the coding region of a proto-oncogene, leaving it nonfunctional d. dominant mutation in a proto-oncogene in which the normal protein product is overexpressedAnother model, the random model, proposes that any cell in a malignant tumor has the potential to form a new tumor. Does the cancer stem cell hypothesis contradict this idea?Can we cure cancer by restoring the function of tumor suppressor proteins such as mutant p53 or pRb? If so, how is this possible?