 
			 
			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 | |