Unraveling Oncogene Activation
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Questions and Answers

Which of the following is a hallmark of cancer according to the text?

  • Resisting cell death
  • Sustaining growth signalling
  • Enabling replicative immortality (correct)
  • Evading growth suppressors

What is the role of telomeres in cell lifespan according to the text?

  • Telomeres shorten genome instability/apoptosis
  • Telomeres maintain chromosome ends (correct)
  • Telomeres cause cell death
  • Telomeres lead to immortalization phase

What is the function of telomerase in normal cells according to the text?

  • Telomerase leads to immortalization phase
  • Telomerase maintains telomere length (correct)
  • Telomerase causes cell death
  • Telomerase shortens telomeres

Which of the following is a hallmark of cancer?

<p>Invasion of local tissue (A)</p> Signup and view all the answers

Which of the following is an environmental factor that can lead to genetic changes and cause cancer to develop?

<p>Physical Agents (C)</p> Signup and view all the answers

What is the primary site in the body where the cancer first developed in Australia in 2022?

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

Which theory of carcinogenesis proposes that normal cells are transformed into cancer cells through abnormal cell division?

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

Which of the following best describes the concept of carcinogenesis?

<p>A multi-step process involving genetic and epigenetic changes in cellular division and regulation (D)</p> Signup and view all the answers

Which of the following accurately describes oncogenes?

<p>Genes that cause cancer when they are activated (D)</p> Signup and view all the answers

Which hypothesis describes the role of tumor suppressor genes in cancer development?

<p>Knudson's Two-Hit Hypothesis (B)</p> Signup and view all the answers

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

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

What type of mutation can lead to uncontrolled continuous activity of an oncogene?

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

Which gene is commonly amplified in small-cell lung cancer, breast/ovarian cancer, and leukemias?

<p>c-myc (D)</p> Signup and view all the answers

What is the role of the TAX gene in adult T-cell leukemia/lymphoma?

<p>Promotes proliferation (B)</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

Which mechanism of oncogene activation involves the formation of novel hybrid fusion genes?

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

Which gene is involved in G1 to S transition and is activated by chromosomal translocation in mantle cell lymphoma?

<p>CCND1 (A)</p> Signup and view all the answers

Which is NOT an outcome triggered by tumor suppressor activation?

<p>Increase cell proliferation (D)</p> Signup and view all the answers

Which of the following is a mechanism of oncogene activation?

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

What is the function of a growth suppressor?

<p>To control cell growth (D)</p> Signup and view all the answers

Which of the following is a hallmark of cancer?

<p>Enabling replicative immortality (C)</p> Signup and view all the answers

How can cancer cells resist apoptosis?

<p>Mutation/loss of TP53 (B)</p> Signup and view all the answers

According to the Tissue Organization Field Theory (TOFT), how do carcinogenic agents contribute to cancer development?

<p>By disrupting interactions between cells that maintain tissue architecture (C)</p> Signup and view all the answers

Which theory of carcinogenesis involves a multi-step process that requires more than one mutation?

<p>Somatic Mutation Theory (SMT) (D)</p> Signup and view all the answers

What are epigenetic modifications in the context of cancer development?

<p>Non-mutational changes that affect gene expression (C)</p> Signup and view all the answers

Which of the following is NOT a characteristic of cancer-associated genes?

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

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

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

What are the two mechanisms by which oncogenes can be activated through chromosomal rearrangements?

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

Which type of abnormality refers to segments within a chromosome that are reversed end to end?

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

Which technique is commonly used to detect gene amplification in haematological malignancies?

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

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