Chapter 8 Harvesting Energy: Glycolysis and Cellular ...
[Pages:30]Chapter 8 Harvesting Energy: Glycolysis and Cellular Respiration
Chapter 8: Glycolysis and Cellular Respiration
What is Glucose Metabolism?
Answer: The breakdown of glucose to release energy from its chemical bonds
Photosynthesis:
6 CO2
+ 6 H2O
+
Light Energy
= C6H12O6
+ 6 O2
Carbon Dioxide
Water
Glucose
Oxygen
Glucose Metabolism:
C6H12O6 + 6 O2 = 6 CO2 + 6 H2O + Energy
Glucose
Oxygen
Carbon Dioxide
Water
Chemical Heat
Chapter 8: Glycolysis and Cellular Respiration
Major Steps of Glucose Metabolism
Mitochondria
Glucose
Cytoplasm 1) Glycolysis (2 ATP)
Oxygen present (Aerobic)
Pyruvate
(36 ATP) 3) Cellular Respiration
No oxygen present (Anaerobic)
2) Fermentation
Carbon Dioxide Water
Ethanol Lactate
Major Steps in Glucose Metabolism:
(Figure 8.1)
Chapter 8: Glycolysis and Cellular Respiration
1) Glycolysis (Greek: "To break down a sweet") ? Ancient biochemical pathway (all organisms do it...) ? Occurs in the cytoplasm; Does not require oxygen
Two Major Components: A) Glucose Activation: Initiate the reaction (takes energy)
2 ATP
2 ADP
CCCCCC
Glucose
(Activation Energy)
C C C x2 P
Glyceraldehyde 3-phosphate (G3P)
Chapter 8: Glycolysis and Cellular Respiration
1) Glycolysis (Greek: "To break down a sweet") ? Ancient biochemical pathway (all organisms do it...) ? Occurs in the cytoplasm; Does not require oxygen
Two Major Components: A) Glucose Activation: Initiate the reaction (takes energy) B) Energy Harvesting: Complete the reaction (makes energy)
4 ADP
C C C x2 P
Glyceraldehyde 3-phosphate
2 NAD+
4 ATP 2 NADH
C C C x2
Pyruvate
Glycolysis in Review:
(Figure 8.2)
Net ATP Gain = 2 ATP
Chapter 8: Glycolysis and Cellular Respiration
Major Steps of Glucose Metabolism
Glucose
1) Glycolysis (2 ATP)
Oxygen present (Aerobic)
Pyruvate
(36 ATP) 3) Cellular Respiration
No oxygen present (Anaerobic)
2) Fermentation
Carbon Dioxide Water
Ethanol Lactate
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