 
			 
			MCQOPTIONS
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				| 1. | The attachment of phosphoryl groups to specific amino acid residues is catalyzed by ___________ | 
| A. | Diphteria toxin and cholera toxin | 
| B. | Dinitrogenase reductase | 
| C. | Protein phosphatases | 
| D. | Protein kinases | 
| Answer» E. | |