 
			 
			MCQOPTIONS
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				| 1. | At the end of each phase of cell cycle cyclins activating Cdks in that phase are inactivated irreversibly by _____________ | 
| A. | Multiple phosphorylations | 
| B. | De-phosphorylation | 
| C. | Ubiquitinylation | 
| D. | Destabilizing by proteolysis in a proteosome | 
| Answer» E. | |