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Understanding Cellular Respiration: Process, Energy, and ATP Production

This resource explores the intricacies of cellular respiration, detailing the chemical processes through which organisms utilize oxygen to convert chemical energy from glucose into ATP. The content differentiates between cellular respiration and digestion, highlights the stages of glycolysis, the Krebs cycle, and the electron transport chain (ETC), and examines how energy in glucose is transformed. Learn more about the importance of ATP, how it powers cellular activities, and the energy loss during these processes.

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Understanding Cellular Respiration: Process, Energy, and ATP Production

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  1. Hmmmm… • When a consumer eats what are they getting? • What do organisms use matter and energy for?(online 7.1 activity) • How is putting chemical energy to work in a cell different than in an auto? • How is the burning of a marshmallow different from eating the marshmallow? (online 7.2 activity) • How is cellular respiration different from digestion? • Cellular Respiration: The chemical process by which organisms use oxygen to convert the chemical energy stored in glucose into another form of chemical energy called ATP. • ATP is then used to do cellular work(transport, mechanical, or chemical work)

  2. Chapter 7 Cellular Respiration • Balanced Chemical Equation: __________________________________ • Reactants are: ____________________ • Products are: _____________________ • Three stages are: 1. 2. 3.

  3. Stage 1: Glycolysis • Does not require ___________ • Occurs in _____________________ of cell • Net gain of ______________

  4. Stage 2: Kreb’s Cycle Cytoplasm Mitochondria Conversion of two pyruvic acid molecules to two acetyl CoA molecules yields: ___ CO2 and ___ NADH

  5. Kreb’s Cycle Yield per acetyl CoA • ___ carbon atoms added from acetyl CoA • ___ carbon atoms removed as ______ • ___ NAD+ converted to _____ NADH • ___ FAD converted to ____ FADH2 • ___ ADP converted to ___ ATP X 2 for each acetyl CoA is a result of ___ NADH, ___ FADH2, and ___ ATP

  6. Stage 3: ETC and ATP Synthase

  7. ETC and ATP Synthase • Electrons from NADH and FADH2 pass along ETC (series of molecules) • Some energy from electrons used to power pump that moves H+ out of inner mitochondria membrane (active transport) • Oxygen accepts pair of electrons at end of ETC, combines with 2H+, creating water • H+ diffuse (passive transport) through ATP synthase into mitochondria • ATP synthase generates ATP, ADP + P  ATP **How many ATP molecules are made from one glucose molecule?

  8. ATP Production per Molecule of Glucose Glucose 2 G3P Gross ___ ATP Net ___ ATP ~63% of energy in glucose molecule lost as heat

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