Put the steps of the process of signal transduction in the order they occur:
1)A conformational change in the signal-receptor complex activates an enzyme.
2)Protein kinases are activated.
3)A signal molecule binds to a receptor.
4)Target proteins are phosphorylated.
5)Second messenger molecules are released.
A)1, 2, 3, 4, 5
B)3, 1, 2, 4, 5
C)3, 1, 5, 2, 4
D)1, 2, 5, 3, 4
E)5, 1, 2, 4, 3