1. Harvesting Chemical Energy in Cells
Next:
Harvesting Chemical Energy in Cells

2. The Role of Respiration Note that Energy Flow is Directional, but Matter is Cycled

3. Harvesting Chemical Energy in Cells: An Overview

4. Cellular RESPIRATION: An Overview

5. Step 1: Glycolysis Let’s Watch!

6. Following Along: Glycolysis

7. Remembering NAD+ and NADH…
You Try:
Part 1, A & B

8. Step 2: The Citric Acid Cycle

9. The Citric Acid Cycle: Following Along

10. The Citric Acid (Kreb’s) Cycle: A Friendly View
You Try! Part 2, 1-4
German scientist Hans Krebs deciphers the Krebs Cycle in 1957.

11. Step 3: The Electron Transport Chain
So far, only 4 molecules of ATP
from each Glucose
Where’s the rest of the energy??
How can we capture it??
You Try:
Part 3, #1
It’s in the electrons!! So we need an electron transport chain!!

12. The ETC pumps H+ into the intermembrane space, creating a concentration gradient
Let’s Watch!

13. Something More Familiar?

14. ATP Synthase is a Molecular Turbine!
You Try:
Part 3, #2 & 3

15. Energetic Summary of Cellular Respiration:
Efficiency = ~40%
You Try: Represent the stages of Cellular Respiration on an energy diagram (Part 4, #1)

16. Can we generate ATP under anaerobic conditions?? How??
Aerobic = oxygen present
Anaerobic = without oxygen

17. Can this proceed indefinitely? Why or why not?
Glycolysis!
Can this proceed indefinitely? Why or why not?

18. Anaerobic Respiration: Alcohol Fermentation

19. Anaerobic Respiration: Lactic Acid Fermentation
You Try: Part 4, #2

20. Last Key Points: Metabolic Pathways are Flexible

21. Last Key Points: Metabolic Pathways are Regulated