Oncogene Activation and DNA Mismatch-Repair Genes Quiz
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Questions and Answers

Which of the following best describes the concept of carcinogenesis?

  • The process of epigenetic changes in cancer cells
  • The process of genetic changes leading to cancer (correct)
  • The process of abnormal gene function and expression
  • The process of cellular division and regulation

What is the function of a tumour suppressor gene?

  • Promote cell division and growth
  • Prevent the formation of oncogenes
  • Inhibit cell division and growth (correct)
  • Enhance the expression of oncogenes

What is Knudson's Two-Hit Hypothesis?

  • A hypothesis about the role of tumour suppressor genes in cancer development (correct)
  • A hypothesis about the role of genetic mutations in carcinogenesis
  • A hypothesis about the role of oncogenes in cancer development
  • A hypothesis about the role of epigenetic changes in cancer development

Which of the following is a hallmark of cancer?

<p>All of the above (D)</p> Signup and view all the answers

Which scenario involves the overexpression of BCL-2::IGH translocation?

<p>Scenario 1 (B)</p> Signup and view all the answers

What is the function of telomeres in cells?

<p>To protect the ends of chromosomes (A)</p> Signup and view all the answers

Which of the following is NOT a hallmark of cancer?

<p>Normal gene function (A)</p> Signup and view all the answers

Which of the following is a characteristic of tumour suppressor genes?

<p>Activation by mutations (C)</p> Signup and view all the answers

What is the primary site in the body where the cancer first developed?

<p>Lungs (B)</p> Signup and view all the answers

What is the process by which normal cells are transformed into cancer cells?

<p>Carcinogenesis (A)</p> Signup and view all the answers

Which theory of carcinogenesis focuses on the disruption of interactions between cells that maintain tissue architecture, repair, and regulation?

<p>Tissue Organization Field Theory (TOFT) (B)</p> Signup and view all the answers

Which theory of carcinogenesis involves genetic changes other than mutations, such as hypermethylation of genes?

<p>Epigenetic Modifications (C)</p> Signup and view all the answers

According to Knudson's Two-Hit Hypothesis, what is the multi-step nature of carcinogenesis attributed to?

<p>Genetic mutations (C)</p> Signup and view all the answers

Which type of genes regulate cell growth and differentiation, and have the potential to become cellular oncogenes?

<p>Proto-oncogenes (C)</p> Signup and view all the answers

Which of the following is NOT one of the mechanisms of oncogene activation?

<p>DNA mismatch-repair (D)</p> Signup and view all the answers

What is the main function of DNA mismatch-repair genes?

<p>Recognize and repair errors during replication and recombination (D)</p> Signup and view all the answers

Which of the following is NOT one of the hallmarks of cancer?

<p>Inducing apoptosis (A)</p> Signup and view all the answers

What is the main function of BCL2 in cancer cells?

<p>Resist apoptosis (A)</p> Signup and view all the answers

Which type of rearrangement is often detected in haematological malignancies and some solid tumors?

<p>Interchromosomal translocations (B)</p> Signup and view all the answers

What is the mechanism of oncogene activation through chromosomal rearrangements?

<p>Both A and B (C)</p> Signup and view all the answers

Which technique is used to detect amplification of the MECOM gene in an AML patient with a ring 3 chromosome?

<p>Directed metaphase FISH (B)</p> Signup and view all the answers

What is the purpose of the MYC-IGH dual colour dual fusion LSI probe in FISH?

<p>To detect MYC and IGH fusion (C)</p> Signup and view all the answers

Which of the following is an example of a point mutation in an oncogene?

<p>Mutation of the K-ras gene at codon 12 (B)</p> Signup and view all the answers

Which of the following is NOT a mechanism of oncogene activation?

<p>Translation of viral RNA into proviral DNA (A)</p> Signup and view all the answers

What is the function of the Abl gene in chronic myeloid leukemia (CML)?

<p>It is a cytoplasmic tyrosine kinase (C)</p> Signup and view all the answers

What is the effect of gene amplification in oncogenesis?

<p>It results in deregulated cell growth (C)</p> Signup and view all the answers

Which type of recurrent rearrangement involves a segment being reversed end to end?

<p>Inversion (D)</p> Signup and view all the answers

What is the mechanism of oncogene activation in case study 1, where the patient has Mantle Cell Lymphoma with t(11;14)(q13;q32)?

<p>De regulated expression of oncogenes via regulatory control of an immunoglobulin gene IGH (A)</p> Signup and view all the answers

What is the mechanism of oncogene activation in case study 2, where the patient has Acute Lymphoblastic Leukaemia with t(11;14)(q23;q32)?

<p>De regulated expression of oncogenes via regulatory control of an immunoglobulin gene IGH (C)</p> Signup and view all the answers

What is the mechanism of oncogene activation in case study 3, where the patient has Burkitt Lymphoma with t(8;14)(q24;q32)?

<p>De regulated expression of oncogenes via regulatory control of an immunoglobulin gene IGH (A)</p> Signup and view all the answers

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