 
			 
			MCQOPTIONS
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				| 1. | The binding of ligands to many GPCRs leads to ___________ | 
| A. | Decrease in concentration of certain intracellular signal molecules called second messengers | 
| B. | Increase in concentration of certain intracellular signal molecules called second messengers | 
| C. | Decrease in concentration of certain extracellular signal molecules called first messengers | 
| D. | Increase in concentration of certain extracellular signal molecules called first messengers | 
| Answer» B. Increase in concentration of certain intracellular signal molecules called second messengers | |