Question

Difference between oxidative phosphorylation and photophosphorylation

Answer 1

In terms of similarities, both processes involve generating a proton electrochemical gradient across a membrane, by pumping protons from an area of lower concentration to a higher concentration. This creates a proton motive force, that causes protons to diffuse through the ATP synthase enzyme embedded in the membrane, which synthesises ATP from ADP and Pi. In both cases, proton pumps are powered by the release of energy as high energy electrons pass down a chain of electron carriers (the electron transport chain).

Oxidative phosphorylation occurs on the inner mitochondrial membrane and the high energy electrons originate from reduced coenzymes NADH and FADH2 (from the Krebs Cycle, Link Reaction and Glycolysis), whereas non-cyclic photophosphorylation occurs on the thylakoid membrane in the chloroplasts, and the electrons originate from water which are excited by photons of light. The inner mitochondrial membrane contains 3 proton pumps but the thylakoid membrane contains 1. The terminal electron acceptor in oxidative phosphorylation is O2, which combines with protons to form water, but in non-cyclic phosphorylation, it is NADP+. Water is produced in oxidative phosphorylation, but water is required in non-cyclic phosphorylation (along with the input of light energy).

Answer 2

Hi dear!

phosphorylation is the procee of formation of ATP from ADP and inorganic phosphorous -

OXIDATIVE PHOSPHORYLATION-

1) occurs during respiration

2) occurs in mitochondria

3) ATP IS PRODUCED FROM ADP and inorganic phosphate by utilising energy from electron transport system

4) oxygen is required for terminal oxidation

5 ) ATP  produced is released in cytoplasm and this energy is  used for various metabolic pathways

PHOTOPHOSPHORYLATION

1) occurs during photo synthesis

2)occurs in chloroplast

3) ATP IS PRODUCED  FROM ADP BY UTILISING ENERGY OF SUNLIGHT

4)OXYGEN IS NOT REQUIRED

5) ATP produced is used in photosynthesis dark rxn

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