Which one of the following is a difference between a normal cell and a cancer cell? A. Normal cells undergo apoptosis while cancer cells don’t. B. Normal cells do not respond to regulatory signals while cancer cells do. C. Normal cells invade surrounding tissues while cancer cells don’t. Which of the following checkpoints determines if DNA replication was successful? a. G2 b. G1 c. M

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For the first question, i think the correct answer is A. Normal cells undergo apoptosis while cancer cells don't. For the second question, The answer is option B. Cell division has two checkpoints namely, G1 checkpoint and spindle assembly checkpoint. The checkpoint which determines if division has properly occurred is the G1 checkpoint. At this point, is a damage in the DNA is detected or the has not reach the optimum size, the cell is stopped in G1 and is not allowed to proceed to further process.

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