I - Final target causes response. II - A ligand binds to the cell surface receptor.
III - The receptor activates a protein at the membrane.
IV Secondary messenger molecules are released.
1. Which of the following correctly places the steps of the signal transduction pathway (shown above) in
order from beginning to end?
a I, II, III, IV
b. II. III. IV.
c. II, III, I, IV
dI ILIY