The true statement about cancer cells is:
b) they grow and divide uncontrollably.
Cancer cells typically exhibit uncontrolled growth and division, which is a hallmark of cancer. The other statements are not accurate concerning cancer cells:
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a) they undergo differentiation: Cancer cells often lose their ability to differentiate properly and can become poorly differentiated or undifferentiated.
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c) they are not affected by mutations: This statement is false; cancer cells arise due to mutations and are heavily influenced by genetic changes.
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d) they have the same growth rate as normal cells: Cancer cells usually have a faster and more uncontrolled growth rate compared to normal cells.