Cellular Respiration
Do Now : Why do we need to breathe?
Equation
Oxygen + GlucoseCarbon dioxide + Water + ATP
26 12 62 2
Reactants Products
2 Kinds of Cellular Respiration• Aerobic: Occurs in the
presence of oxygen
• Anaerobic: Occurs when no oxygen is present.
Aerobic Respiration3 stages
1. Glycolysis
2. Krebs cycle
3. Electron Transport Chain
Glycolysis• First stage in cellular respiration
• Only stage that does not require O2
One cell can produce thousands of ATP molecules in a few milliseconds!!!
Requires 2ATPs to start.
End Product = 4 ATP
Net Gain: 2 ATP
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 36-38 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 : FermentationDo 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.