Cellular Respiration Cellular Respiration: Harvesting Chemical Energy Ppt from: aurumscience.com.
Ch 6 Cellular Respiration. Energy for life ECOSYSTEM Photosynthesis in chloroplasts Glucose Cellular...
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Transcript of Ch 6 Cellular Respiration. Energy for life ECOSYSTEM Photosynthesis in chloroplasts Glucose Cellular...
Energy for lifeECOSYSTEM
Photosynthesisin chloroplasts
Glucose
Cellular respirationin mitochondria
H2O
CO2
O2
(for cellular work)
ATP
Heat energy
Breathing vs Cellular Respiration
• Breathing- gas exchange• Cellular respiration- aerobic harvesting of
energy from food molecules by cells
Cellular Respiration
• Stores energy in ATP
C6H12O6 + 6 O2
Glucose Oxygen
6 CO2
Carbondioxide
+ 6 H2O
Water
+ ATPs
Energy
Redox
• Oxidation- loss of e-• Reduction- addition of e-
Loss of hydrogen atoms(oxidation)
6 CO2 + 6 H2O + Energy
Gain of hydrogen atoms(reduction)
(ATP)C6H12O6 + 6 O2
Glucose Oxidation
• Dehydrogenase• NAD+
2 H+ + 2 e–
Oxidation
Dehydrogenase
ReductionNAD+ + 2 H NADH + H+
(carries2 electrons)
ETC• Electron Transport Chain
ATPNAD+
NADH
H+
H+2e–
2e–
Electron transport
chain
Controlledrelease ofenergy forsynthesis
of ATP
+
O2
H2O
12
Glycolysis
• Splits sugar• Breaks Glucose into 2
three C sugars• Yields 2 pyruvate
molecules –Net gain of +2 ATP
Glucose
NAD++ 2
2 ADP
NADH2
P2
2
ATP2+
H+
2 Pyruvate
Glycolysis
• Substrate-level phosphorylation– Transfer of P from substrate to ADP
• Energy banked in ATP and NADH
ADP
ATP
Enzyme
Product
Enzyme
P
P
PSubstrate
Stopping the chain
ATP
H+
O2
H2O
12 H+
NAD+NADH
FADH2FAD
PADP +
Chemiosmosis
+ 2
Electron Transport Chain
H+
H+H+
H+
H+H+
ATPsynthase
DNP
H+
H+
H+
Rotenone Cyanide,carbon monoxide
Oligomycin
DNP
ATP yieldCytoplasm
Glucose
FADH2
Mitochondrion
Maximum per glucose:
OXIDATIVEPHOSPHORYLATION(Electron Transportand Chemiosmosis)
CITRIC ACIDCYCLE
Electron shuttleacross membrane
2NADH
2 NADH
2NADH
6 NADH 2
(or 2 FADH2)
2 AcetylCoA
GLYCOLYSIS2
Pyruvate
About38 ATP
about 34 ATP
by substrate-levelphosphorylation
by oxidative phosphorylation
2 ATP
by substrate-levelphosphorylation
2 ATP
FermentationGlucose
NADH
NAD+
2
2 2 ADP
P
ATP2
NADH
2
NAD+
2
2 ADP
P
ATP2
2 Pyruvate
2 Lactate
GL
YC
OL
YS
IS
GL
YC
OL
YS
IS
NADH
NAD+
2
2
NADH2
NAD+2
2 Pyruvate
2 Ethanol
Glucose
CO22
released
2 2