Respiration — practice question

Reduced ................................ passes hydrogen atoms to cytochrome carriers. The hydrogen atoms separate into protons and electrons, and the electrons move from one carrier to the next. The energy released by electron transfer is then used to pump protons into the ................................, establishing a proton gradient across the ................................ . Protons ................................ through the channel protein called ................................, into the matrix, where ATP is produced. The protons join with electrons and ................................ atoms to make water.