Cellular
Respiration
Do Now : Why do we need to
breathe?
Equation
Oxygen + Glucose
Carbon dioxide + Water + ATP
2
6
12
6
Reactants
2
2
Products
2 Kinds of Cellular Respiration
• Aerobic: Occurs in the
presence of oxygen
• Anaerobic: Occurs when no
oxygen is present.
Aerobic Respiration
3 stages
1. Glycolysis
2. Krebs cycle
3. Electron Transport Chain
Glycolysis
• First stage in cellular respiration
• Only stage that does not require O2
Requires 2ATPs to start.
End Product = 4 ATP
Net Gain: 2 ATP
One cell can produce
thousands of ATP molecules in
a few milliseconds!!!
REVIEW: What is the
purpose of glycolysis?
To break down glucose
Krebs Cycle
• CO2 is released as a waste gas
• Requires O2
• Occurs in
mitochondria
• Produces 2 ATPs
Electron Transport Chain
• ADP is converted into ATP
• Up to 34 ATPs can be produced
Aerobic
respiration yields
a net total of 3638 ATPs
Question:
Which step of aerobic respiration
produces the most ATPs (most
efficient step)?
ETC- Electron Transport Chain
Question :
In what part of the cell aerobic
respiration takes place?
Mitochondria
AIM : Fermentation
Do Now Discuss photosynthesis and explain its
importance to an organism. In your answer, be
sure to:
• identify the organelle where this process occurs
• identify two raw materials necessary for this
process
• identify one energy-rich molecule that is
produced by this process
• state how organisms use the energy-rich molecule
that is produced
• state how a gas produced by this process is
recycled in nature
Fermentation
• Anaerobic process: occurs in absence
of O2.
• Recycles NAD+ ,so that glycolysis
can continue producing 2ATPs for
every round.
• Does not produce any ATP
2 kinds of fermentation:
1. Alcoholic Fermentation
2. Lactic Acid Fermentation
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Alcoholic Fermentation
+
2
Ex: Yeast in Bread
Lactic Acid Fermentation
+
Produced in muscle cells during
exercise when body is no longer
able to supply O2 to cells.