Identify the statements that accurately describe how hydrogen ion concentration relates to energy production in oxidative phosphorylation.
1) ATP synthase provides energy in the form of ATP to actively transport H+ into the mitochondrial matrix.
2) The pH in the intermembrane space is higher than the pH in the mitochondrial matrix.
3) ATP synthase forms a channel for hydrogen ions to enter the mitochondrial matrix and couples the energy gained from the diffusion of hydrogen ions to the release of ATP.
4) Energy is generated as a result of the difference in hydrogen ion concentraiton between the intermembrane space and the cytoplasm.
5) Hydrogen ions cannot freely pass through the inner mitochondrial membrane.
6) Hydrogen ion concentraion is lower in the mitochondrial matrix than in the intermembrane space.