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ZingPath: Cellular Energy: Respiration

Electron Transport Chain

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Cellular Energy: Respiration

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Electron Transport Chain


Learning Made Easy

You get to reveal the ways in which cells use the energy stored in sugar to produce the ATP that powers their chemical reactions. View each of the major pathways involved in ATP production, and then see how this compares to photosynthesis.

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Now You Know

After completing this tutorial, you will be able to complete the following:

  • Briefly explain the reactions of the electron transport chain (ETC).

Everything You'll Have Covered

What is the electron transport chain embedded in?

~ The electron transport chain is embedded in the cell membranes of prokaryotes and the inner membranes of mitochondria in eukaryotes.

What happens as electrons pass from one molecule to another?

~ Electrons lose energy as they pass from one molecule to another.

What happens to the lost energy in the electron transport chain?

~ The lost energy in the electron transport chain is used to move protons (positive hydrogen ions: H+) from the matrix to the gap between the inner and outer mitochondrial membrane.

What do the rushing ions in the ATP synthetase provide the ADP molecules with?

~ The rushing ions in the ATP synthetase provide the ADP molecules with kinetic energy that causes them to strike the phosphates and stick together. This produces ATP molecules.

During aerobic respiration, where is most of the cell's ATP, or energy, directly produced?

~ Most ATP is generated at the electron transport chain. The first steps of aerobic respiration (glycolysis and the Krebs cycle) generate small amounts of ATP.

Where do the electrons in the electron transport chain come from?

~ The electrons are brought to the electron transport chain proteins by NADH and FADH2.

What purpose does oxygen serve in the electron transport chain?

~ Oxygen removes the leftover electrons once their energy has been extracted and stored as ATP.

Tutorial Details

Approximate Time 2 Minutes
Pre-requisite Concepts Students should be able to define the following terms: ATP synthetase, cellular respiration, and chemiosmosis.
Course Biology
Type of Tutorial Animation
Key Vocabulary ATP synthetase, cellular respiration, chemiosmosis