Arrange the events of a second messenger system in the correct order
1) protein kinase is activated
2) G protein is activated
3) neurotransmitter binds to its receptor
4) protein closes potassium channel
5) cyclic AMP is produced
6) phosphorylation takes place
a. 1 ? 2 ? 5 ? 6 ? 4 ? 3
b. 3 ? 5 ? 6 ? 1 ? 2 ? 4
c. 5 ? 2 ? 6 ? 1 ? 3 ? 4
d. 3 ? 2 ? 5 ? 1 ? 6 ? 4
e. 5 ? 2 ? 6 ? 1 ? 4 ? 3
D
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