Arrange the events of a second messenger system in the correct order.
1) Protein kinase is activated.
2) G protein is activated.
3) The neurotransmitter binds to its receptor.
4) The protein closes the potassium channel.
5) Cyclic AMP is produced.
6) Phosphorylation takes place.
A) 1 → 2 → 5 → 6 → 4 → 3
B) 3 → 5 → 6 → 1 → 2 → 4
C) 5 → 2 → 6 → 1 → 3 → 4
D) 3 → 2 → 5 → 1 → 6 → 4
E) 5 → 2 → 6 → 1 → 4 → 3

Question

Quizplus · Accepted Answer

The correct sequence for a second messenger system starts with the neurotransmitter binding to its receptor (3), which activates a G protein (2). This leads to the production of cyclic AMP (5), which then activates protein kinase (1). Protein kinase phosphorylates various proteins (6), leading to cellular responses such as the closing of potassium channels (4).

Arrange the Events of a Second Messenger System in the Correct