Oxidative Phosphorylation Flashcards
1
Q
Where does it occur?
A
Inner Mitochondrial Membrane
2
Q
What happens in Oxidative Phosphorylation?
A
- Hydrogen atoms from NADH and FADH2 released
- H atoms split to H+ ions and electrons
- Electrons enter electron transport chain
- Energy released used to transport H+ ions across inner mitochondrial membrane from matrix to intermembrane space
- Concentration of protons between these 2 cause protons to diffuse by facilitated diffusion through channel protein ATP Synthase
- As H+ diffuses through ATP Synthase, conformational change in its shape occurs allowing ADP and Pi to combine forming ATP
- Movement of protons down concentration gradient provides energy for ATP synthesis
- Oxygen is the final electron acceptor and combines with protons and electrons at the end of the electron transport chain to form water.
3
Q
What is the chemiosmotic theory? (short)
A
- Energy from electrons passed through electron transport chain is used to pump H+ ions against concentration gradient from mitochondrial matrix to intermembrane space
- H+ ions then diffuse via facilitated diffusion through ATP Synthase transport proteins back into the matrix
- Energy of H+ ions flowing down concentration gradient results in phosphorylation of ADP into ATP by ATP Synthase