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

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

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Cell Cycle
The G0 phase is

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

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Cell Cycle
A centromere is

the structure to which microtubules attach
All of these
a constriction on a chromosome bound to a disk
another name for kinetochore

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