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ZingPath: Cellular Energy: Respiration

Krebs Cycle

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Cellular Energy: Respiration

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Lesson Focus

Krebs Cycle


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:

  • Describe how the Krebs cycle occurs.

Everything You'll Have Covered

After which reactions is pyruvate formed?

~ Pyruvate is formed as a result of glycolysis reactions.

Who was the Krebs cycle named after?

~ The Krebs cycle was named after German biochemist Hans Krebs, who first proposed the idea of a metabolic cycle.

Where does the Krebs cycle take place?

~ The Krebs cycle takes place in the mitochondria matrix.

How does the Krebs cycle begin?

~ The Krebs cycle begins with the formation of one citric acid molecule from a 4-carbon molecule and an acetyl CoA molecule.

What happens to the electrons that are lost during the Krebs cycle?

~ During the Krebs cycle, lost electrons are retained by NAD+ and FAD. This compound is then transferred to the electron transport chain to generate energy.

Describe the energy conversions that occur during the Krebs cycle.

~ The energy in pyruvate molecules is released, and used to produce some ATP. Also, high-energy electrons are used to produce NADH and FADH2. These molecules go on to the electron transport chain, where their energy is then released.

Tutorial Details

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