Biology 152 Lecture 1 Section 1 Lessons Help Instructor Resources About

Cell Biology > Chemiosmosis



All cells need to make ATP. Early on in the evolution of cells, a highly efficient mechanism for ATP synthesis arose: chemiosmosis.

Chemiosmosis is central to the metabolism of many types of cells: a methane-producing prokaryote living in an anaerobic swamp; a heart muscle cell burning glucose in the presence of O2; and a clover leaf mesophyll cell using sunlight to synthesize sugars. In each of these situations, chemiosmosis is the process that allows the cell to harvest energy from oxidation reactions and synthesize ATP.

In this lesson, you'll learn how chemiosmosis works and the pivotal role it plays in the metabolism of many cell types.

  graphic of a chloroplast, bacteria, and mitochondria

Are you ready for this lesson?

To use this lesson, you should have:

  • Reviewed your lecture notes
  • Read the relevant pages from your text book
  • Reviewed the tutorial on Thermodynamics

Lesson Topics


Click a topic below. We recommend progressing in sequence.

Topic 1: Components of Chemiosmosis Topic 2: Chemiosmosis in eukaryotic organelles Topic 3: Evolution of Chemiosmosis



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