What is the Difference Between Oxidative phosphorylation and Photophosphorylation?
🆚 Go to Comparative Table 🆚Oxidative phosphorylation and photophosphorylation are both energy-generating processes that involve the synthesis of ATP, but they differ in their occurrence, energy sources, and specific mechanisms. Here are the main differences between the two:
- Occurrence: Oxidative phosphorylation occurs in mitochondria during cellular respiration, while photophosphorylation takes place in chloroplasts during photosynthesis.
- Energy Source: The energy source for oxidative phosphorylation is glucose, while the energy source for photophosphorylation is sunlight.
- Site: Oxidative phosphorylation occurs within the mitochondria, while photophosphorylation occurs within the thylakoids in chloroplasts.
- Electron Acceptors: In oxidative phosphorylation, the final electron acceptor is molecular oxygen, while in photophosphorylation, the final electron acceptor is NADP+.
- Proton Gradient: During oxidative phosphorylation, protons accumulate in the intermembranous region of mitochondria, while in photophosphorylation, protons accumulate in the lumen of the chloroplast.
In both processes, electrons are transferred through a series of membrane proteins, providing energy to pump protons to one side of the membrane. The protons then flow back through a special enzyme called ATP synthase, which produces ATP.
On this pageWhat is the Difference Between Oxidative phosphorylation and Photophosphorylation? Comparative Table: Oxidative phosphorylation vs Photophosphorylation
Comparative Table: Oxidative phosphorylation vs Photophosphorylation
Here is a table comparing the differences between oxidative phosphorylation and photophosphorylation:
Feature | Oxidative Phosphorylation | Photophosphorylation |
---|---|---|
Location | Mitochondria | Chloroplast |
Occurrence | Cellular Respiration | Photosynthesis |
Energy Source | Enzymes and Oxygen | Sunlight |
Final Electron Acceptor | Oxygen | NADP+ |
Production of Proton Gradient | Electron Transport System (ETS) generates a proton gradient by pumping protons from the matrix into the intermembranous space of the mitochondria. | Protons are pumped from the stroma into the thylakoid during the light-dependent reactions of photosynthesis. |
Proton Gradient Used for ATP Production | Chemiosmosis of H+ ions down the concentration gradient through the pores of ATP synthase. | Chemiosmosis of H+ ions down the concentration gradient through the pores of ATP synthase. |
Despite these differences, both processes share some similarities:
- Both processes are essential for energy transfer within living systems.
- Both processes involve the utilization of redox intermediates.
- The production of a proton motive force leads to the transfer of H+ ions across the membrane in both processes.
- The energy gradient created by both processes is used to produce ATP from ADP.
Read more:
- Substrate Level Phosphorylation vs Oxidative Phosphorylation
- Phosphorylation vs Dephosphorylation
- Cyclic vs Noncyclic Photophosphorylation
- Photooxidation vs Photorespiration
- Oxidative vs Nonoxidative Pentose Phosphate Pathway
- Phosphorylase vs Phosphatase
- Oxygenation vs Oxidation
- Photocatalysis vs Electrocatalysis
- ATP vs NADPH
- Oxygenic vs Anoxygenic Photosynthesis
- Kinase vs Phosphorylase
- Photosystem 1 vs Photosystem 2
- Oxidases vs Oxygenases
- Photochemical vs Electrochemical Reaction
- Electron Transport Chain in Mitochondria vs Chloroplasts
- Phototrophs vs Chemotrophs
- Phosphoryl Group vs Phosphate Group
- Photoluminescence vs Fluorescence
- Chemiosmosis in Mitochondria vs Chloroplast