 
			 
			MCQOPTIONS
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				| 1. | cAMP and cGMP are derived from | 
| A. | ATP and GTP by the actions of adenylate cyclase and guanylate cyclase respectively | 
| B. | GTP and ATP by the actions of adenylate cyclase and guanylate cyclase respectively | 
| C. | ATP and GTP by the actions of guanylate cyclase and adenylate cyclase respectively | 
| D. | none of the above | 
| Answer» B. GTP and ATP by the actions of adenylate cyclase and guanylate cyclase respectively | |