Cell Cycle
At the center of the cell cycle control system is Cdk, a protein that

is phosphorylated to become active
manufactures growth factors
binds to different cyclins
is only active during mitosis

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Cell Cycle
The cell cycle is controlled in most cells by

time (after a certain length of time the cell divides)
cell size (when the cell reaches a certain size, it divides)
different cells exhibit different control strategies
a series of checkpoints

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Cell Cycle
The G0 phase is

another name for interphase
All of these
the state of most cells in an animal body
a permanent state of all body cells

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