CHAPTER6 - Chapter 6 Cellular Respiration I Cellular...

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Chapter 6: Cellular Respiration I. Cellular metabolism = Respiration A. Glucose is a potential energy source which must be broken down chemically and the energy transferred to ATP B. Chemical formula for aerobic respiration Glucose + Oxygen -----> Carbon Dioxide + Water + ATP II. Anaerobic Respiration A. This chain of reactions takes place without oxygen present B. Steps: 1. Glycolysis a. Site- cytoplasm of the cell b. Steps: 1. Each molecule of glucose is broken down to form (2) molecules of pyruvic acid (a 3-carbon compound) 2. 2 molecules of ATP are used to initiate the process 3. During glycolysis, 4 molecules of ATP are generated resulting in a net gain of 2 molecules of ATP 4. In addition, 2 NADH molecules are formed 2. Fermentation - occurs only under anaerobic conditions a. Lactic acid fermentation 1. The pyruvic acid is rearranged to form 2 lactic acid compounds (3- carbon) 2. In addition, NADH is converted back into NAD 3. The NAD returns to glycolysis to continue the process 4. Examples: a. Milk or cream turned sour is a sign that bacterial cells are using this pathway b. A lack of oxygen to muscle cells during exercise causes lactic acid
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