9.2 - The Process of Cellular Respiration Worksheet.doc -...

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Name Jenna Abusad Class Date 9.2 The Process of Cellular Respiration Lesson Objectives Describe what happens during glycolysis. Describe what happens during the Krebs cycle. Explain how high-energy electrons are used by the electron transport chain. Identify how much ATP cellular respiration generates. Lesson Summary Glycolysis The word glycolysis literally means “sugar-breaking.” The end result is 2 molecules of a 3-carbon molecule called pyruvic acid. 2 ATP molecules are used at the start of glycolysis to get the process started. High-energy electrons are passed to the electron carrier NAD + , forming two molecules of NADH. 4 ATP are synthesized during glycolysis for a net gain of 2 ATP. The Krebs Cycle The second stage of cellular respiration is the Krebs cycle , which operates only when oxygen is available. The Krebs cycle is a series of energy-extracting reactions. Pyruvic acid produced by glycolysis enters mitochondria. In the innermost compartment of a mitochondrion, or the matrix , pyruvic acid molecules are broken down into carbon dioxide and acetyl-CoA molecules.

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