SBI4U: Anaerobic Respiration
SBI4U: Anaerobic Respiration
What is anaerobic respiration?
• An anaerobic process (________________________________)
• Glucose undergoes 2 steps: _____________________ and ________________________
• Produces only _________ ATP!
Why do cells use anaerobic respiration?
• Used by organisms that can live in ______________________ environments
• Used by human _________________ cells when they don’t have enough Oxygen
• Cells performed anaerobic respiration long before anaerobic respiration occurred (the early was an ____________________environment)
• After glycolysis cells need a way to convert NADH back to _________________
o There is a __________________________ of NAD+ so cells need to reuse it!
o NADH ____________________ producing an alcohol/ carboxylic acid and NAD+
There are 2 main types of Anaerobic Respiration
1. Lactic Acid Fermentation
• Occurs in _____________________________________________
2. Alcohol Fermentation
• Occurs in _____________________________________________
Lactic Acid Fermentation
• Used by human muscle cells in times of ____________________________ (during intense exercise)
• Converts pyruvate to ____________________________________
• Lactate has a _____________________taste and is produced by the bacteria used to make yogurt (___________________________________________)
• Accumulation of lactic acid in the muscles results in _______________________
Steps in Lactic Acid Fermentation
1. Glucose is converted to ______________________ resulting in ______ ATP and _____NADH (GLYCOLYSIS!)
2. The 2 pyruvate molecules are reduced to 2 Lactate molecules and the 2 NADH are oxidized to NAD+
3. In humans lactate is transferred through the blood from the ________________ to the _______________
• When there is enough Oxygen again the liver ____________________ lactate back to _______________________ where it re-enters aerobic respiration
Ethanol Fermentation
• Used in a variety of food-producing processes
• Production of _________________________________ all depend on the process of ethanol fermentation
• Converts pyruvate to __________________ and ______________________
Steps in Ethanol Fermentation:
1. Glucose is converted to ______________________ resulting in ______ ATP and _____NADH (GLYCOLYSIS!)
2. Pyruvate is converted to 2 _________________and 2 _____________________
3. Acetylaldehyde is reduced to 2 _______________ and 2 NADH are ___________________ to 2 NAD+
Homework:
1. Pg. 124 Q: 2, 3, 4, 5, 6, 7, 8a, 9
2. Read Page 119 in your text book. How does yeast make bread rise?
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