The following reactions are all common parts of some hormone processes:
1) Binding of the hormone to a receptor.
2) Synthesis of cyclic AMP
3) Phosphorylation of the target enzyme.
4) Release of a G-protein from the interior cell membrane.
5) Activation of a protein kinase.
A typical path of reactions would follow this sequence:
A) 1 → 2 → 4 → 3 → 5.
B) 1 → 4 → 2 → 3 → 5.
C) 1 → 4 → 2 → 5 → 3.
D) 1 → 2 → 4 → 5 → 3.
E) 2 → 1 → 4 → 5 → 3.

Question

Quizplus · Accepted Answer

The typical pathway for many hormone processes starts with the hormone binding to its receptor (1), which leads to the release of a G-protein from the interior cell membrane (4). This G-protein then activates the synthesis of cyclic AMP (2), which in turn activates a protein kinase (5). The activated protein kinase then phosphorylates the target enzyme (3), completing the signal transduction pathway.

The Following Reactions Are All Common Parts of Some Hormone