Question

check the box to indicate whether the event described by each statement occurs during the normal cell cycle or abnormal cell cycle. check one box for each statement.
normal abnormal
results in a condition called cancer
involves special proteins called cyclins
can be caused by overexposure to x - rays
has an environmental limit to prevent cells from dividing endlessly

Explanation:

Cancer is an abnormal condition resulting from uncontrolled cell - cycle progression. Cyclins are involved in the normal regulation of the cell cycle. Overexposure to X - rays can cause abnormal cell - cycle changes leading to mutations and potentially cancer. Environmental limits that prevent cells from dividing endlessly are part of the normal cell - cycle regulation to maintain tissue homeostasis.

Answer:

Results in a condition called cancer: Abnormal
Involves special proteins called cyclins: Normal
Can be caused by overexposure to X - rays: Abnormal
Has an environmental limit to prevent cells from dividing endlessly: Normal