Dinitrophenol (DNP) was marketed as a weight loss drug in the 1930 's but was later banned in the US because of dangerous complications including death. How DNP works: DNP allows protons (H+)to cross the mitochondrial inner membrane, back into the matrix. The crossing of the protons generates heat but no ATP because the protons do not pass through the ATPase channel. The electron chain transport (flow of electrons) is not affected by DNP. Question: 1. Please describe what happens to the proton gradient generated by the electron transport chain if DNP is transporting H+ across the inner membrane into the matrix. 2. What happens to ATP synthesis by oxidative phosphorylation in the presence of DNP? 3. Please propose how DNP would work as a weight loss drug? But a dangerous weight loss drug?.