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A-Level Biology OCR A

Protons Gradient Membrane Describe Chemiosmosis Energy Atp Produced

A proton gradient is produced in chemiosmosis by pumping protons across a membrane using energy from electron transport; this gradient is useful because it drives ATP synthesis as protons flow back through ATP synthase.

A proton gradient is produced in chemiosmosis by pumping protons across a membrane using energy from electron transport; this gradient is useful because it drives ATP synthesis as protons flow back through ATP synthase.

Front Describe how a proton gradient is produced in chemiosmosis and describe the usefulness of the proton gradient.
Back Chemiosmosis proton gradient:
  • Energy released from electrons moving from one carrier to another used to pump protons across the membrane
  • Gradient maintained becaue membrane is impermeable to protons
  • This means only way for protons to diffuse down concentration gradient is through hydrophilic membrane channels linked to ATP synthase
  • The flow of protons provides energy used to synthesise ATP

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