respiration part 1 chpt 9 2007 2008
TRANSCRIPT
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8/14/2019 Respiration Part 1 Chpt 9 2007 2008
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AP Biology 2005-2006
Chapter 9 [Part One].Cellular Respiration
Harvesting Chemical Energy
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The Point is to Make ATP!
ATP
Whats the point?
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Harvesting energy stored in glucose
Glucose is the model catabolism of glucose to produce ATP
glucose + oxygencarbon + water+ energydioxide
C6H12 O6 6O2 6CO2 6H2O ATP+ + + + heat
CO2 + H2O + heatfuel(carbohydrates)
combustion = making heat energy
by burning fuels in one step
respiration = making ATP (& less heat)
by burning fuels in many small steps
ATP
CO2 + H2O + ATP (+ heat)
resp
ira
tio
n
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How do we harvest energy from fuels?
Digest large molecules into smaller ones break bonds & move electrons from one
molecule to another
as electrons move they carry energy with them that energy is stored in another bond, released
as heat, orharvested to make ATP
+
e-
+e-
+ loses e- gains e- oxidized reduced
oxidation reduction
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How do we move electrons in biology?
Moving electrons in living systems, electrons do not
move alone
electrons move as part ofH atom
+
H
+H
+ loses e- gains e- oxidized reduced
oxidation reduction
C6H12 O6 6O2 6CO2 6H2O ATP+ + +
oxidation
reductionH
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Oxidation & reduction
Oxidation adding O
removing H
loss of electrons releases energy
exergonic
Reduction removing O
adding H
gain of electrons stores energy
endergonic
C6H12 O6 6O2 6CO2 6H2O ATP+ + +
oxidation
reduction
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Moving electrons in respiration
Electron carriers move electrons by shuttlingH atoms around NAD+NADH (reduced) FAD+2FADH2 (reduced)
+ Hreduction
oxidation
PO
O
O
O
P
O
OO
O
CC
O
NH2
N+
H
adenine
ribose sugar
phosphates
NADnicotinamide
Vitamin B3
PO
O
O
O
P
O
OO
O
CC
O
NH2
N+
H HNADH
stores energy
as a reducedmolecule
reducing power!
How efficient!Build once,
use many ways
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Overview of cellular respiration
4 metabolic stages Anaerobic respiration 1. Glycolysis
respiration without O2
in cytosol
Aerobic respiration respiration using O
2
in mitochondria 2. Pyruvate oxidation
3. Krebs cycle
4. Electron transport chain
C6H12 O6 6O2 6CO2 6H2O ATP+ + + (+ heat)
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The Point is to Make ATP!
ATP
Whats the point?
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Any Questions??