Answer to Question #214368 in Molecular Biology for Moe

Question

1.6) Describe the similarities and differences in chemiosmosis between oxidative phosphorylation in mitochondria and photophosphorylation in chloroplast

Answer 1

Both ways create a proton gradient across a membrane. OXIDATIVE- The electrons come from organic molecules. Mitochondria transfer chemical energy from food molecules to ATP.

Electron transport chains built into a membrane pump protons across the membrane as electrons are passed down the chain in a series of redox reactions. The difference is that in respiration, organic molecules provide the electrons and chemical energy is transferred to ATP, whereas in chloroplasts water provides the electrons as light energy is transformed to the chemical energy of ATP.