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Step 1: Glycolysis
Mitochondria
Glucose
C C
C
Enzyme
C
C C
C6H12O6
• Where? In cytoplasm
• What happens?
A) Glucose (from our food) is broken down into 2
pyruvates
B) 2 ATP molecules released for cellular processes
What’s after Glycolysis?
glycolysis
ATP
ATP
Step 2: Fermentation
Yeast perform alcoholic
fermentation to make
bread. Why isn’t bread
alcoholic?
Alcohol evaporates in
the baking process
During prolonged exercise, the oxygen
you inhale mainly goes to your brain.
Howmuscles
to relieve
Your
aresore
nowmuscles:
lacking oxygen.
1) Massage
2) Bananas
3) Stretch after
4) Hydrate
Muscle cells perform fermentation to
keep you going!
• Two Types of Fermentation (both anaerobic):
A) Lactic Acid fermentation
– Performed by animals when muscles are not receiving oxygen
– Lactic acid waste created
B) Alcoholic fermentation
– Performed by yeast, some plants, bacteria
– Alcohol & CO waste created
Lactic Acid vs. Alcoholic Fermentation
glycolysis
Lactic
acid
glycolysis
Alcohol
+ CO2
Lactic acid
fermentation
Lactic Acid
• Location: Cytoplasm
• Amount of ATP created: Zero
• The Point? Make molecules
to restart glycolysis
• Waste: Lactic acid
Alcoholic
fermentation
Alcoholic
• Location: Cytoplasm
• Amount of ATP created: Zero
• The Point? Make molecules
to restart glycolysis
• Waste: Alcohol and CO2
Aerobic Respiration
Where? In the mitochondria
Steps? Kreb’s cycle and
electron transport chain
Glycolysis:
-- In the cytoplasm
-- Glucose is split into 2
pyruvate
-- 2 ATP created
What happens? Pyruvate
converted into 34 ATPs
Fermentation
(anaerobic respiration)
Where? In the cytoplasm
Glycolysis restarts
What happens?
Pyruvate is broken into
either lactic acid or alcohol
 Molecules to restart
glycolysis created (No ATP)
Recap
1)
2)
3)
4)
5)
6)
Name the two types of fermentation.
How much ATP does glycolysis create?
How much ATP does fermentation create?
Which molecule is broken down during glycolysis?
A buildup of which molecule causes sore muscles?
Which waste molecules are created by alcoholic
fermentation?
7) Is fermentation aerobic or anaerobic? What does this
mean?
8) Why is aerobic respiration preferred vs.
fermentation?