 
			 
			MCQOPTIONS
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				| 1. | Passage of a cell through stages of cell cycle is controlled by a protein kinase that phosphorylates many different proteins at appropriate times. | 
| A. | Cdk activating kinase | 
| B. | Cyclin-dependent kinase | 
| C. | Cyclins | 
| D. | Tyrosine kinase | 
| Answer» C. Cyclins | |