Answer

Where are the protons pumped?

When succinate dehydrogenase feeds two electrons directly into the mitochondrial electron transport chain and the electrons are ultimately picked up by the terminal electron acceptor, protons are pumped across a membrane. Where are the protons pumped? Identify which ETS complexes pump protons as a result of these two electrons reaching the terminal electron acceptor. Where are the protons pumped?

Intermembrane space of the mitochondria

Complex Protons Pumped
One 4
Two 0
Three 4
Four 2