Biology 152 Lecture 1 Section 1 Lessons Help Instructor Resources About

Cell Biology > Chemiosmosis > Topic 1: Components of Chemiosmosis

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What's Chemiosmosis?


Osmosis is the process of diffusion of water molecules across a selectively permeable membrane. Chemiosmosis is the process of diffusion of ions (usually H+ ions, also known as protons) across a selectively permeable membrane.

As in osmosis, chemiosmosis leads to a concentration gradient of the diffusing ion across the membrane. A concentration gradient is a form of potential energy that can do work. In many cells, a proton gradient provides the energy for the synthesis of ATP.

What you'll learn in this topic

  • How an electron transport chain creates a proton gradient
  • How ATP synthase uses the proton gradient to make ATP

Your task is to is to observe how chemiosmosis works in a bacterial cell.

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