In the control of the cell cycle, how do cyclin-dependent kinases (CDKs) directly promote cell division?

In eukaryotic cells, what molecular system primarily controls progression through the cell cycle at key checkpoints (e.g., G1/S and G2/M)?

In the context of control of the cell cycle, which proteins stimulate cell division by activating cyclin-dependent kinases (CDKs) to promote progression through checkpoints?

In the context of control of the eukaryotic cell cycle, what is MPF (maturation-promoting factor)?

In the context of control of the cell cycle, what does the G0 phase represent?

In a typical eukaryotic cell cycle, how many major checkpoints are commonly described that regulate progression through the cycle?

In the context of control of the cell cycle, what is the primary purpose of checkpoints?

In the context of control of the cell cycle, what is the primary role of cell-cycle checkpoints (e.g., G1/S, G2/M, and the spindle assembly checkpoint)?

In the context of control of the cell cycle, what is the primary purpose of cell cycle checkpoints?