Arrange the following events in proper sequence:
(1) The activating hormone interacts with a membrane-bound receptor.
(2) Cyclic AMP causes the cell to carry out a function characteristic for that specific hormone.
(3) Adenylyl cyclase catalyzes the transformation of ATP to cyclic AMP.
(4) Adenylyl cyclase is activated.
A) 1, 2, 3, 4
B) 1, 4, 3, 2
C) 3, 4, 2, 1
D) 1, 3, 2, 4
E) 1, 3, 4, 2

Question

Quizplus · Accepted Answer

The correct sequence for the events in a typical signaling pathway involving cyclic AMP (cAMP) as a second messenger starts with the hormone binding to its receptor (1), which then activates adenylyl cyclase (4). Adenylyl cyclase converts ATP into cyclic AMP (3), and finally, cyclic AMP carries out the hormone's specific function in the cell (2).

Arrange the Following Events in Proper Sequence