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A-Level Biology OCR A

Electron Protons Oxidative Chain Energy Atp Explain Phosphorylation

In oxidative phosphorylation, hydrogen atoms from NADH and FADH2 dissociate into electrons and protons; electron energy pumps protons across the membrane, creating a gradient used by ATP synthase to produce ATP, with oxygen as the final electron acceptor forming water.

In oxidative phosphorylation, hydrogen atoms from NADH and FADH2 dissociate into electrons and protons; electron energy pumps protons across the membrane, creating a gradient used by ATP synthase to produce ATP, with oxygen as the final electron acceptor forming water.

Front Explain oxidative phosphorylation step by step.
Back Oxidative phosphorylation:
  • Hydrgoen atoms collected by NAD and FAD delivered to electron transport chain
  • They dissociate into protons and electrons
  • Energy is released during redox reactions as electrons reduce and oxidise electron carriers as they flow along the chain
  • Energy is used to pump out protons - proton gradient created
  • Protons diffuse through ATP synthase - synthesis of ATP (chemiosmosis)
  • At the end of chain, electrons combine with H+ and oxygen to form water (oxygen is final electron acceptor)

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