Download Ch 9, Part 4 Notes, Anaerobic Respiration/Fermentation

VI. Anaerobic Respiration
This process occurs when
oxygen is NOT available to produce
ATP.
OR FOR ORGANISMS THAT DON’T
NEED AS MUCH ENERGY!
A. 2 Stages to ANaerobic CR
1. Glycolysis – 1st stage (same as normal CR)
a. Reactant: Glucose
b. Products: 2 ATP
2 NADH
2 pyruvic acid
2. Fermentation- 2nd stage. occurs instead of
Krebs and ETC when NO oxygen is available.
B. No oxygen available so:
1. No free NAD+ molecules in the cell
2. Fermentation does NOT produce ATP.
(The only ATP from anaerobic respiration
is from glycolysis!)
A. It changes NADH- to NAD+, so
glycolysis can continue.
.
C. Two types of fermentation:
1. Alcoholic
2. Lactic Acid
D. Alcoholic Fermentation
1. Only bacteria and yeast use this
2. Reactants: Pyruvic acid and NADH (from glycolysis)
3. Products:
a. alcohol (2 carbon molecule)
b. carbon dioxide
c. NAD+
4. EQUATION:
pyruvic acid + NADH alcohol +CO2 + NAD+
5. Used in baking and alcohol industries
Yeast

Alcoholic Fermentation
CO2 bubbles
CO2 bubbles make
Bread rise and make
bubbles in beer
E. Lactic Acid Fermentation
1. Takes place in:
a. skeletal muscle cells during vigorous
exercise
i. muscles can’t get oxygen fast enough
for aerobic CR
ii. creates burning and soreness
in muscles during and after exercise.
b. In the food industry, bacteria
use lactic acid to make:
i. dairy products
ii. pickled products
The NAD+ allows glycolysis to happen again.
4. Reactants: Pyruvic Acid and NADH (from glycolysis)
5. Products: Lactic acid and NAD+
6. EQUATION:
Pyruvic acid + NADH  lactic acid + NAD+
Comparing
Aerobic CR
Anaerobic Fermentation CR
Anaerobic Lactic Acid CR
Aerobic
1. Cell type- body cells under normal
conditions
2. Reactants- glucose and oxygen
3. Products- carbon dioxide and water
Energy- 36 ATP’s
4. 3 STAGES: Glycolysis, Krebs cycle, ETC
Anaerobic-Alcohol Fermentation
1. Cell type- Bacteria and yeast
2. Reactant- glucose
3. Products- Alcohol, carbon dioxide and NAD+
Energy – 2 ATP- FROM GLYCOLYSIS
NOT FERMENTATION
4. 2 STAGES: Glycolysis, Alcoholic fermentation
Anaerobic Lactic Acid
1. Cell type- muscle cells when no oxygen
available (and bacteria)
2. Reactant- glucose
3. Products- lactic acid and NAD+
Energy – 2ATP – FROM
GLYCOLYSIS NOT ERMENTATION!
4. 2 STAGES: Glycolysis, Lactic acid fermentation