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Cancer quiz #3

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  • When cells become cancerous, what changes occur?
    Cells exhibit uncontrolled growth, loss of differentiation, and the ability to invade other tissues.
  • What is the normal function of the p53 gene product?
    The p53 gene product is a tumor suppressor that can initiate apoptosis in response to DNA damage.
  • How do mutations relate to the development of cancer?
    Mutations in specific genes can lead to cancer
  • In which cellular process are the cancer-causing forms of the RAS protein involved?
    Cell division
  • How is cancer cell growth different from normal cell growth?
    Cancer cell growth is unregulated and can lead to tumor formation, while normal cell growth is controlled and regulated.
  • Which protein is considered a tumor suppressor because it can initiate apoptosis?
    A) p53, because it can initiate apoptosis
  • What is cancer and how is it characterized at the cellular level?
    Cancer is a disease characterized by uncontrolled cell division, leading to the formation of tumors.
  • What are the two main types of tumors?
    The two main types of tumors are malignant tumors and benign tumors.
  • What does it mean for a tumor to metastasize?
    Metastasize means to spread from the original site to other organs in the body.
  • Do benign tumors metastasize?
    No, benign tumors do not metastasize; they remain localized.
  • What is the role of a capsule in benign tumors?
    A capsule surrounds benign tumors, helping to contain them and prevent their spread.
  • What are proto-oncogenes?
    Proto-oncogenes are normal genes that promote appropriate cell division.
  • What are tumor suppressor genes?
    Tumor suppressor genes are genes that inhibit cell division, acting as a 'red light' to prevent uncontrolled growth.
  • What is an example of a tumor suppressor gene?
    p53 is an example of a tumor suppressor gene.
  • What is an oncogene?
    An oncogene is a mutated proto-oncogene that promotes uncontrolled cell division, contributing to cancer development.
  • Why is the balance between proto-oncogenes and tumor suppressor genes important?
    The balance ensures that cell division occurs only when needed and is properly regulated, preventing uncontrolled growth.
  • How do healthy cells prevent the development of cancer?
    Healthy cells use proto-oncogenes to promote and tumor suppressor genes to inhibit cell division, maintaining proper control.
  • What happens when both proto-oncogenes and tumor suppressor genes are mutated?
    Mutations in both can lead to loss of cell cycle control and increase the risk of cancer.
  • What is the primary characteristic of cancer cells compared to normal cells?
    Cancer cells divide uncontrollably, ignoring normal regulatory signals.
  • Can benign tumors cause health complications?
    Yes, benign tumors can cause health issues, but they are generally less dangerous than malignant tumors.
  • What is the significance of a tumor being capsulated?
    Capsulated tumors, like benign tumors, are contained and less likely to spread.
  • How do mutations in cell cycle regulatory genes lead to cancer?
    Mutations can disrupt normal regulation, causing uncontrolled cell division and tumor formation.
  • Why is understanding proto-oncogenes and tumor suppressor genes important in cancer biology?
    Because they are key regulators of cell division, and their mutations are central to cancer development.
  • What does it mean for a gene to act as a 'red light' in cell division?
    It inhibits cell division, as tumor suppressor genes do.
  • What is the consequence of unrestrained cell growth?
    Unrestrained cell growth can lead to cancer and tumor formation.
  • How do normal cells maintain control over cell division?
    By balancing the activity of proto-oncogenes and tumor suppressor genes.
  • Why are malignant tumors often more life-threatening than benign tumors?
    Because they can invade other tissues and organs, spreading cancer throughout the body.
  • How can a single mutation in a proto-oncogene contribute to cancer?
    It can convert the proto-oncogene into an oncogene, leading to unregulated cell division.
  • What is the significance of cell cycle regulation in cancer prevention?
    Proper regulation prevents uncontrolled cell growth and tumor formation.
  • What is the role of genetic mutations in the transformation of normal cells into cancer cells?
    Genetic mutations disrupt normal regulatory mechanisms, leading to cancer.
  • What is the main danger of metastasis in cancer progression?
    Metastasis allows cancer to spread to vital organs, making it harder to treat and more deadly.
  • What is the impact of multiple mutations in cell cycle regulatory genes?
    Multiple mutations greatly increase the risk of uncontrolled cell growth and cancer.
  • What is the ultimate consequence of unchecked cell division in the body?
    Unchecked cell division leads to tumor formation and the development of cancer.