 
			 
			MCQOPTIONS
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				| 1. | The binding of ligands to many G-proteins linked receptors leads to shortlived | 
| A. | increase in the concentration of certain intracellular signaling molecules called second messenger | 
| B. | decrease in the concentration of certain intracellular signaling molecules called second messenger | 
| C. | increase in the concentration of certain extracellular signaling molecules called first messenger | 
| D. | decrease in the concentration of certain extracellular signaling molecules called first messenger | 
| Answer» B. decrease in the concentration of certain intracellular signaling molecules called second messenger | |