Question

which of the following questions will best direct an investigation of the mechanism of atp synthase?
a what is the source of the inorganic phosphate that is used to generate atp from adp?
b is the phosphorylation of adp by atp synthase dependent on the formation of a proton gradient?
c can atp synthase use the energy released by phosphorylation of adp to pump protons against a concentration gradient?
d can oxidative phosphorylation be uncoupled from the electron transport chain?

Explanation:

ATP synthase is an enzyme that synthesizes ATP from ADP and inorganic phosphate. The image shows a proton gradient (\([H^{+}]\)) which is a key element in the mechanism of ATP synthase. Option B directly relates to the role of the proton gradient in the phosphorylation of ADP by ATP synthase, which is central to understanding its mechanism. Option A is about the source of inorganic phosphate, which is not directly about the mechanism of ATP synthase. Option C has the energy flow backwards (ATP synthase uses proton gradient energy for phosphorylation, not the other way around). Option D is about oxidative phosphorylation and electron transport chain uncoupling, not directly about ATP synthase mechanism.

Answer:

B. Is the phosphorylation of ADP by ATP synthase dependent on the formation of a proton gradient?