Multiple Choice
Both skin cancer (arising from the epidermis) and most lung cancers are classified as which type of malignant tumor based on tissue of origin?
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3. Energy & Cell Processes
Cancer
Multiple Choice
Which of the following processes do normal proto-oncogenes typically exhibit?
A
They normally suppress tumor growth.
B
They enhance tumor growth.
C
They stimulate normal cell growth and division.
D
They are underexpressed in cancer cells.
Verified step by step guidance1
Understand the role of proto-oncogenes: Proto-oncogenes are genes that normally help cells grow. They are essential for normal cell function and division.
Differentiate between proto-oncogenes and oncogenes: When proto-oncogenes mutate, they can become oncogenes, which may lead to uncontrolled cell growth and potentially cancer.
Identify the normal function of proto-oncogenes: In their normal state, proto-oncogenes stimulate normal cell growth and division, ensuring that cells proliferate as needed for healthy tissue maintenance and repair.
Clarify the misconception about tumor suppression: Proto-oncogenes do not suppress tumor growth; rather, they promote normal cell growth. Tumor suppressor genes are responsible for inhibiting cell division and preventing tumor formation.
Recognize the expression levels in cancer cells: In cancer cells, proto-oncogenes may be overexpressed or mutated, leading to enhanced cell growth and division, contributing to tumor development.
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