In certain cancerous cells, the cell divides continuously even in the absence of a growth factor (signaling molecule) that indicates the cell should divide. Which of the following could explain this?
A) a receptor molecule that is always turned on
B) a receptor molecule that is always turned off
C) a transduction pathway that is always turned off
D) a target protein that is always deactivated
E) a gene for cell division that is not expressed when it should be
Correct Answer:
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