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Questions and Answers
What is the main cause of cancer according to the passage?
What is the main cause of cancer according to the passage?
- Environment
- Genetic heritage (correct)
- Choice of lifestyle and occupation
- Luck
Where do signals for growth come from in cancer cells?
Where do signals for growth come from in cancer cells?
- Nucleus of the cell
- Mitochondria of the cell
- Outside the cell (correct)
- Inside the cell
From which type of cells do carcinomas arise?
From which type of cells do carcinomas arise?
- Neural epithelium cells
- Mesoderm cells
- Ectoderm cells
- Endoderm cells (correct)
What is the characteristic of cancer cells related to the cell cycle times?
What is the characteristic of cancer cells related to the cell cycle times?
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What percentage of human tumors are produced by chemical carcinogens that arise from epithelial cells?
What percentage of human tumors are produced by chemical carcinogens that arise from epithelial cells?
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Study Notes
Causes of Cancer
- The main cause of cancer is not clearly stated in the passage, as it does not provide a specific explanation.
Cancer Cell Signaling
- Signals for growth in cancer cells come from within the cells themselves.
Origins of Carcinomas
- Carcinomas arise from epithelial cells.
Characteristics of Cancer Cells
- Cancer cells are characterized by abnormal cell cycle times, which are often accelerated.
Chemical Carcinogens
- Approximately 90% of human tumors are produced by chemical carcinogens that arise from epithelial cells.
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