Which of the following statements concerning cancer
cells is most accurate?
a. Proto-oncogenes are part of the regulatory
section of a chromosome.
b. Tumor cells have lost their ability to stop
dividing.
c. Proto-oncogenes help control runaway cell
division.
d. Benign tumor cells usually spread only to
adjacent organs.
e. Metastasis is the spread of benign cells.
Answer: b
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