Construct a Functional Signal Transduction Pathway by Placing the Following

Multiple Choice

Construct a functional signal transduction pathway by placing the following actors in the correct order:
A.upstream signaling protein
B.second messenger
C.receptor protein
D.first messenger
E.target proteins
F.downstream signaling protein

A) D, E, C, A, B, F
B) C, D, A, B, F, E
C) D, C, A, B, F, E
D) D, C, B, A, F, E