Which statement albout the cell cycle control system is FALSE?

$q,$

There are several checkpoints throughout the cell cycle, where go$-$ahead signals must be recelved before the cyde can continue.

Once bound by cyclins, Cdks become active immediately. So the Cdks usually have their cydlinbinding domains blocked by inhibitors until a go$-$ahead signal is received.

The amounts of cyclins in the cell change in a cyclic manner during the cell cycle. The amount's of Cdks stay relatively constant, but their activity levels rise and fall in response to the levels of their partner cyclins.

Cyclin$-$dependent kinases $($Cdks$)$ activate other proteins to carry out the many processes of the cell cycle.