| 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 |
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