1. Glycolsis and Citric Acid Cycle
Cellular Respiration
Glycolsis and Citric Acid Cycle

2. Photosynthesis in chloroplasts Cellular respiration in mitochondria
Figure 9.2
Light energy
ECOSYSTEM
Photosynthesis in chloroplasts
 O2
Organic molecules
CO2  H2O
Cellular respiration in mitochondria
Figure 9.2 Energy flow and chemical recycling in ecosystems.
ATP powers most cellular work
ATP
Heat energy

3. Redox Reactions The summary equation for cellular respiration:
C6H12O6 + 6 O2  6CO2 + 6H2O
What is oxidized and what is reduced?
What is the oxidizing agent?

4. Mobile Electron Carriers
What is the mobile electron carrier in Glycolysis?
NAD+

5. Which Way is more energy released?
Figure 9.5
Which Way is more energy released?
H2  1/2 O2
2 H 
1/2 O2
(from food via NADH)
Controlled release of energy for synthesis of ATP
2 H+  2 e
ATP
Explosive release of heat and light energy
ATP
Electron transport chain
Free energy, G
Free energy, G
ATP
2 e
Figure 9.5 An introduction to electron transport chains.
1/2 O2
2 H+
H2O
H2O
(a) Uncontrolled reaction
(b) Cellular respiration

6. Electrons carried via NADH Substrate-level phosphorylation
Figure 9.6-1
Electrons carried via NADH
Glycolysis
Glucose
Pyruvate
CYTOSOL
MITOCHONDRION
Figure 9.6 An overview of cellular respiration.
ATP
Substrate-level phosphorylation

7. Electrons carried via NADH Electrons carried via NADH and FADH2
Figure 9.6-2
Electrons carried via NADH
Electrons carried via NADH and FADH2
Pyruvate oxidation
Glycolysis
Citric acid cycle
Glucose
Pyruvate
Acetyl CoA
CYTOSOL
MITOCHONDRION
Figure 9.6 An overview of cellular respiration.
ATP
ATP
Substrate-level phosphorylation
Substrate-level phosphorylation

8. Electrons carried via NADH Electrons carried via NADH and FADH2
Figure 9.6-3
Electrons carried via NADH
Electrons carried via NADH and FADH2
Oxidative phosphorylation: electron transport and chemiosmosis
Pyruvate oxidation
Glycolysis
Citric acid cycle
Glucose
Pyruvate
Acetyl CoA
CYTOSOL
MITOCHONDRION
Figure 9.6 An overview of cellular respiration.
ATP
ATP
ATP
Substrate-level phosphorylation
Substrate-level phosphorylation
Oxidative phosphorylation

9. Enzyme Enzyme ADP P Substrate ATP Product
Figure 9.7
Enzyme
Enzyme
ADP P
Substrate
ATP
Figure 9.7 Substrate-level phosphorylation.
Product

10. MITOCHONDRION CYTOSOL CO2 Coenzyme A NAD NADH + H Acetyl CoA
Figure 9.10
MITOCHONDRION
CYTOSOL
CO2
Coenzyme A 1 3 2
NAD
NADH
+ H
Acetyl CoA
Figure 9.10 Oxidation of pyruvate to acetyl CoA, the step before the citric acid cycle.
Pyruvate
Transport protein

11. Pyruvate CO2 NAD CoA NADH + H Acetyl CoA CoA CoA Citric acid cycle
Figure 9.11
Pyruvate
CO2
NAD
CoA
NADH
+ H
Acetyl CoA
CoA
CoA
Citric acid cycle
2 CO2
Figure 9.11 An overview of pyruvate oxidation and the citric acid cycle.
FADH2
3 NAD
FAD
3 NADH
+ 3 H
ADP + P i
ATP