Put the Steps of the Process of Signal Transduction in the Order

Multiple Choice

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