Arrange the events in the pathway activated by G-protein-coupled receptors (GPCRs) in the correct order
1. Activation of effector
2. Activation of protein kinases
3. Receptor binds first messenger
4. Production of second messenger
5. Activation of G protein
a. 1?3?5?2?4
b. 2?3?5?4?1
c. 3?1?5?4?2
d. 3?5?1?4?2
e. 3?5?2?4?1
ANSWER: d
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