Download Topic 9: Respiration

SFR 100 – Topic #9 : Respiration
Topic #9
Respiration.
(Campbell and Reece 163-183)
I.
II.
Objectives
A.
Understand basic process for recovering energy from sugar and other organic
molecules.
B.
Relate material to previous topics.
Introduction.
A.
Cellular respiration (aerobic respiration)
B.
Cellular metabolism.
C.
Redox.
D.
NADH is an electron carrier
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SFR 100 – Topic #9 : Respiration
III.
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Glycolysis (Stage I of Respiration).
A. Reaction summaries:
1.
Glucose + 2 ATP + enzymes  2 G3P + 2 ADP
(glyceraldehyde-3-phosphate)
B.
2.
2 G3P + 2 NAD+ + 2 ADP + enzymes  2 PGA + 2 NADH + 2H+ + 2 ATP
(phosphoglycerate)
3.
2 PGA + 2 ADP + enzymes  pyruvate + 2 ATP + 2H2O
Glucose= C6H12O6 oxidized to pyruvate=C3H303-
IV.
Fermentation.
V.
Aerobic respiration in mitochondria.
A.
Mitochondria.
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SFR 100 – Topic #9 : Respiration
B.
Stage II.
1.
Pyruvic acid oxidized to produce 2CO2 and 2 NADH plus acetyl-CoA.
C.
Stage III - Krebs cycle or citric acid cycle.
D.
Stage IV.
1.
E.
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6O2 + 10 NADH (20 e- 10 H+) + 10H+ + 2FADH2 (4 e- 4 H+) + 32ADP +
32PO4  12H2O (24 e- 24 H+) + 2 NAD+ 32 ATP
Final accounting.
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SFR 100 – Topic #9 : Respiration
VI.
Other sources of energy.
A.
Fats.
1.
Hydrolysis.
2.
P3G and acetyl-CoA produced.
3.
More hydrogen, more energy.
a)
B.
Oxidative phosphorylation.
b)
Double the energy of carbohydrates.
Proteins.
1.
Amino group removed to form ammonia.
2.
VII.
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Products fed into respiration pathways.
Key Terms.
aerobic respiration
anaerobic respiration
metabolism
anabolism
catabolism
anaerobic metabolism
aerobic metabolism
glycolysis
substrate-level
phosphorylation
P3G
NADH
pyruvic acid
fermentation
lactic acid
ethyl alcohol
acetyl-CoA
Krebs citric acid cycle
FADH
respiratory electrontransport chain
oxidative phosphorylation
chemiosmosis
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