From Regina Bailey,
Your Guide to Biology.
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The energy required to power living cells comes from the sun. Plants capture this energy and convert it to organic molecules.

Animals in turn, can gain this energy by eating plants or other animals. The energy that powers our cells is obtained from the foods we eat.

The most efficient way for cells to harvest energy stored in food is through cellular respiration, a catabolic pathway for the production of adenosine triphosphate (ATP).

Glucose, derived from food, is broken down during cellular respiration to provide energy in the form of ATP and heat. Cellular respiration has three main stages: glycolysis, the citric acid cycle, and electron transport.

Do you know which stage of cellular respiration produces the most ATP molecules? Test your knowledge of cellular respiration. To take the Cellular Respiration Quiz, simply click on the "Start The Quiz" link below and select the correct answer for each question. JavaScript must be enabled to view this quiz.

To learn more about cellular respiration before taking the quiz, visit the following pages.

Cellular Respiration
10 Steps of Glycolysis

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