Electron transport chain.
As electrons are transferred down the ETC _________ are pumped into the _____________________________ which establishes an electrochemical gradient, and makes that space very (acidic/basic).
a) Protons; thylakoid membrane; acidic
b) Electrons; mitochondria; basic
c) Protons; mitochondrial matrix; basic
d) Electrons; thylakoid membrane; acidic