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Cell Energy: Cellular Respiration - Process, Pathways, and Efficiency

Learn about cellular respiration, the process cells use to break down organic molecules for energy. Explore the three major pathways - Glycolysis, Krebs Cycle, and Oxidative Electron Transport. Understand the efficiency of aerobic and anaerobic processes. Discover where each pathway takes place in the cell. Compare cellular respiration with photosynthesis.

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Cell Energy: Cellular Respiration - Process, Pathways, and Efficiency

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  1. Bellwork: 1/15 Put your phone up  Week 1/14-1/18 Grab lab notebook List each step of photosynthesis & describe what happens in each step. What is the chemical equation for CR?

  2. Today: • Bellwork • Unit 4, Pt. 3 Notes • Lab Set-Up

  3. Materials • Unit Book • Lab Notebook

  4. This Week: • Monday: Photosynthesis POGIL • Tues/Wed: Unit 4 Pt. 4 Notes, Set-Up Lab Notebook • Thursday: CR Lab • Friday: CR POGIL

  5. Homework

  6. Unit IV: Cell Energy

  7. Part IV:Cellular Respiration

  8. Think… • Which of the following organisms can undergo cellular respiration?

  9. Cellular Respiration • Definition: The process cells use to break down complex organic molecules for the production of energy • Chemical Reaction: • C6H12O6 + 6O2 6CO2 + 6H2O + ATP

  10. Animation • On your note guide, list two concepts you learned from the animation • http://www.sumanasinc.com/webcontent/animations/content/cellularrespiration.html

  11. Biochemical Pathways Three Major Pathways: • Glycolysis • Krebs Cycle (Citric Acid Cycle) • Oxidative Electron Transport

  12. Phases • Anaerobic: Oxygen is NOT required • 1st Stage: Glycolysis • Aerobic: Oxygen is required • 2nd Stage: Krebs Cycle • 3rd Stage: Oxidative Electron Transport

  13. Efficiency • Aerobic process is more effective! • Anaerobic processes can produce ATP for short periods of time in the absence of oxygen • BUT not enough to keep cells alive

  14. Location of Pathways • Step 1: Glycolysis • Cytoplasm • Step 2: Krebs • Mitochondria • Step 3: OET • Mitochondria

  15. Mitochondria • Krebs Cycle • Mitochondrial Matrix (thick liquid inside inner membrane) • Oxidative Electron Transport • Inner Membrane

  16. Glycolysis • Main Function: break down glucose to produce pyruvate • Makes 2 ATP molecules • Pyruvate is then modified • Into Acetyl CoA & enters the mitochondria for the next step

  17. Glycolysis

  18. Animation • Chemical Energy: 2 ATP in while 4 ATP out (net 2 ATP) & NAD+ into NADH (high energy electron carrier) • H2O is created • http://www.sumanasinc.com/webcontent/animations/content/cellularrespiration.html

  19. Krebs Cycle • Main Function: • break down Acetyl CoA from pyruvate to CO2 • Makes NADH & FADH2 • These carry high energy electrons  • Makes 2 ATP molecules • The CO2 you exhale is made in this process

  20. Animation • Pyruvate turns into Acetyl CoA before Krebs starts • Aerobic: Needs oxygen to receive electrons from NADH & FADH2 in OET to recycle NAD+ and FAD back to Krebs to keep it going • http://www.sumanasinc.com/webcontent/animations/content/cellularrespiration.html

  21. OET • Main Function: • Accepts energized electrons from NADH & FADH2 • Passes those electrons to O2 • O2 accepts these electrons • This produces water (H2O) • Makes 32 ATP molecules • Electron movement provides energy for ATP production

  22. Animation • NADH & FADH2 give high energy electrons to pump protons across membrane to power ATP synthase • O2 grabs electrons & H+ to form H20 • http://www.sumanasinc.com/webcontent/animations/content/cellularrespiration.html

  23. PSET vs OET • Electron donor: H2O • Electron acceptor: NADP+ • Electron donor: NADH & FADH2 • Electron acceptor: O2

  24. ANSWER QUESTIONS IN NOTE GUIDE

  25. Cellular Respiration Photosynthesis • Plants • Sunlight required • Glucose accumulated • Energy from the sun stored in glucose • Carbon Dioxide taken in • Oxygen given off • Produces glucose & oxygen from carbon dioxide, water and sunlight • 3 phases: Light absorption, Calvin Cycle & PSET • Occurs in chloroplasts • All living cells, even plants! • Sunlight not required • Glucose broken down • Energy of glucose released • Carbon Dioxide given off • Oxygen taken in • Produces ATP, water & carbon dioxide from glucose & oxygen • 3 phases: glycolysis, citric acid cycle & OET • Occurs in cytoplasm & mitochondria

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