Regulation of Cell Cycle

AP Biology· difficulty 2/5

The graph illustrates that cancer cells fail to:

A
$Express any cyclins$
B
$Form a contractile ring$
C
$Synthesize DNA$
D
$Show density-dependent inhibition$
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Explanation

Normal cells stop dividing when they fill the available area (density-dependent inhibition / contact inhibition); cancer cells lose this regulation and keep dividing.

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