A pesticide was found to cause cancer in laboratory mice. Which of the following would be the most reasonable hypothesis to pursue?
a. The pesticide mutates one oncogene to a proto-oncogene and one tumor suppressor gene to an inactive form.
b. The pesticide mutates an oncogene to a proto-oncogene.
c. The pesticide mutates both tumor suppressor genes to inactive forms.
d. The pesticide mutates both oncogenes to proto-oncogenes.
Answer: c. The pesticide mutates both tumor suppressor genes to inactive forms.
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