Put the Following Events in the Process of Signal-Transduction in Order

Multiple Choice

Put the following events in the process of signal-transduction in order: 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) 3,1,2,5,4
C) 3,1,5,2,4
D) 1,3,4,2,5