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Cellular Respiration (8.3) State Standard SB3A. Explain the cycling of energy through the processes of photosynthesis and respiration. Chapter 8 Cellular Energy 8.3 Cellular Respiration Overview Organisms obtain energy in a process called cellular respiration. The equation for cellular respiration is the opposite of the equation for photosynthesis. Label the reactants & products below. Chapter 8 Cellular Energy 8.3 Cellular Respiration Overview Cont’d Cellular respiration occurs in 3 parts. Glycolysis Krebs Cycle Electron Transport Chain (Together, the KC & ETC make up Aerobic Respiration) Chapter 8 Cellular Energy 8.3 Cellular Respiration Glycolysis Takes place in the cytoplasm Glucose is broken down Anaerobic (without oxygen) Glucose enters the cell by active transport Enzymes break it down into pyruvate Net result = 2 ATP Precedes aerobic respiration Chapter 8 Cellular Energy 8.3 Cellular Respiration Aerobic Respiration: Krebs Cycle Purpose: Breaks down the pyruvate from glycolysis to produce molecules used in the electron transport chain. Location: Mitochondria Products: 6 CO2 2 ATP 8 NADH 2 FADH2 Chapter 8 Cellular Energy 8.3 Cellular Respiration Aerobic Respiration: Krebs Cycle Cont’d • What happens to the products? 6 CO2 – gets released (by-product) 2 ATP – used for energy-requiring processes 8 NADH & 2 FADH2 – move on to help generate ATP in the next step Chapter 8 Cellular Energy 8.3 Cellular Respiration AR: Krebs Cycle Cont’d • Circle the parts of the diagram that help you recognize it as Krebs Cycle. Chapter 8 Cellular Energy 8.3 Cellular Respiration AR: Electron Transport Chain (ETC) • Final step in the breakdown of glucose Purpose: Converts ADP to ATP by transferring electrons Location: Mitochondria Products: ATP (34) CO2 H 2O Chapter 8 Cellular Energy 8.3 Cellular Respiration Anaerobic Respiration AKA fermentation The anaerobic pathway that follows glycolysis Occurs in the cytoplasm Generates small amounts of ATP Chapter 8 Cellular Energy 8.3 Cellular Respiration Anaerobic Respiration Cont’d 2 main types Lactic acid fermentation -muscles cells -microorganisms used to produce foods such as cheese, yogurt, & sour cream Alcohol fermentation -yeast -some bacteria Chapter 8 Cellular Energy Chapter Diagnostic Questions In which metabolic process are molecules broken down to produce carbon dioxide and water? A. photosynthesis B. cellular respiration C. homeostasis D. fermentation 1. 2. 3. 4. 0% A 0% B A B C D 0% C 0% D Chapter 8 Cellular Energy 8.1 Formative Questions Why is cellular respiration a catabolic pathway? 1. 2. 3. 4. 0% C 0% B A 0% A B C D 0% D A. Energy is used to form glucose and oxygen. B. Energy is converted from water to carbon dioxide. C. Energy that is lost is converted to thermal energy. D. Energy is released by the breakdown of molecules. Chapter 8 Cellular Energy 8.3 Formative Questions What is the overall purpose of cellular respiration? 1. 2. 3. 4. 0% C 0% B A 0% A B C D 0% D A. to make ATP B. to process H2O C. to store glucose D. to deliver oxygen Chapter 8 Cellular Energy 8.3 Formative Questions A B C D 0% C B A 1. 2. 3. 4. 0% D Which represents the general sequence of cellular respiration? A. TCA cycle chemiosmosis glycolysis B. glycolysis Krebs cycle electron transport C. electron absorption catalysis phosphorylation D. aerobic pathway anaerobic pathway 0% 0% fermentation Chapter 8 Cellular Energy 8.3 Formative Questions Which stage of cellular respiration is the anaerobic process? 1. 2. 3. 0% B A 0% A B C 0% C A. glycolysis B. Krebs cycle C. electron transport Chapter 8 Cellular Energy 8.3 Formative Questions Which molecule generated by the Krebs cycle is a waste product? 1. 2. 3. 4. 0% C 0% B A 0% A B C D 0% D A. CoA B. CO2 C. FADH2 D. NADH Chapter 8 Cellular Energy Chapter Assessment Questions During the Krebs cycle, pyruvate is broken down into what compound? A. H2O B. O2 C. CO D. CO2 1. 2. 3. 4. 0% D 0% C 0% B A 0% A B C D Chapter 8 Cellular Energy Standardized Test Practice What prevents pyruvate from entering the Krebs cycle and instead results in this pathway? A. a buildup of CO2 B. a lack of oxygen C. an excess of glucose 1. 2. 3. 4. 0% 0% D 0% C A 0% B D. an increased demand for ATP A B C D