___ the gradient with the synthesis of ATP via oxidative phosphorylation.
(I) The F_o portion of ATP synthase
(II) Thermogenin uncouples
(III) 2,4-dinitrophenol (DNP) dissipates
(IV) An ionophore capable of transporting potassium ions across the membrane

Question

Quizplus · Accepted Answer

The gradient is necessary for the synthesis of ATP via oxidative phosphorylation as it drives the rotation of ATP synthase, allowing for the conversion of ADP to ATP. 
Thermogenin uncouples the electron transport chain from ATP synthesis, causing the energy to be dissipated as heat instead of being used to create a proton gradient. 
2,4-dinitrophenol (DNP) dissipates the proton gradient by uncoupling oxidative phosphorylation, leading to a decrease in ATP synthesis. 
An ionophore capable of transporting potassium ions across the membrane would not directly affect the proton gradient necessary for ATP synthesis. Therefore, the correct answer is II,III.

___ the Gradient with the Synthesis of ATP Via Oxidative