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Cellular Respiration 7.5
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Cellular Respiration
I. Glycolysis
II. Kreb’s Cycle
III. Electron Transport Chain
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I. Glycolysis
Occurs in cytoplasm
Starts w/:
6 C sugar (glucose)
2 ATP
Ends w/:
2, 3 C pyruvic acids
2 NADH (to E.T.C.)
4 ATP (two useable)
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II. Kreb’s Cycle
In mitochondria’s matrix
Starts w/
Pyruvic acid and H2O Acetyl CoA (acetyl coenzyme A)
Ends w/
4 NADH (to E.T.C.)
1 FADH2 (to E.T.C.)
3 CO2(g)
1 ATP
Cycle spins twice!!!
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… totals so far …
ATP
4 or 6
NADH
10
FADH2
2
6
III. Electron Transport Chain
In mitochondria’s inner
membrane
NADH and FADH2 releasing e-
e- “fall” to O
ATP generated
H+ O2 and e- form . . .
Water
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Electron Transport Chain cont’
Each NADH produces 3 ATP
Each FADH2 produces 2 ATP
10 NADH x 3 ATP =
30 ATP
2 FADH2 x 2 ATP =
4 ATP
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Final Totals of Cellular Respiration:
Glycolysis
2 ATP (4)
Kreb’s
2 ATP
ETC
~ 34 ATP
~ 38 ATP
per one molecule of glucose
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Cellular Respiration Equation
C6H12O6 + 6O2 6CO2 + 6H2O + ATP’s
ATP ADP + Phosphate + Energy
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Fermentation
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Fermentation
Occurs when little or no O2 is available
“Choice” to generate ATP:
Glycolysis
Fermentation . . .
Cellular Respiration
“aerobic”
“anaerobic”
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Fermentation: Muscle and Microorganism
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