Anaerobic respiration word equations: animals vs plants/yeast.
Reveal answer
Animals: glucose → lactic acid. Plants and yeast: glucose → ethanol + carbon dioxide.
Key words: lactic acid · ethanol
2(f) RESPIRATION · RECALL
2.38 Anaerobic respiration word equations
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Why does bread rise?
Reveal answer
Yeast respires → releases CO₂ → bubbles trapped in dough.
Key words: carbon dioxide
Does anaerobic respiration in muscle make carbon dioxide?
Reveal answer
No, only lactic acid.
Key words: lactic acid
What is meant by the term lactic acid?
Reveal answer
Specification term for the product of anaerobic respiration in animal muscle; present mainly as lactate in cells.
Key words: lactic acid
What is meant by the term ethanol?
Reveal answer
An alcohol produced during anaerobic respiration in plants and yeast.
Key words: ethanol
What is meant by the term alcoholic fermentation?
Reveal answer
Anaerobic conversion of sugars to ethanol and carbon dioxide by organisms such as yeast.
Key words: alcoholic fermentation
What is meant by the term recovery?
Reveal answer
Post-exercise processes restoring physiological and metabolic conditions.
Key words: recovery
Two anaerobic outcomes: for Animal muscle, give the word equation and the application or consequence.
Reveal answer
Word equation: glucose → lactic acid (lactate) Application or consequence: Supports short-term ATP production during intense demand.
Key words: Animal muscle
Two anaerobic outcomes: for Yeast, give the word equation and the application or consequence.
Reveal answer
Word equation: glucose → ethanol + carbon dioxide Application or consequence: Bread, beer and wine production.
Key words: Yeast
Two anaerobic outcomes: for Plant tissue, give the word equation and the application or consequence.
Reveal answer
Word equation: glucose → ethanol + carbon dioxide Application or consequence: Can occur in oxygen-poor or waterlogged tissue.
Key words: Plant tissue
Two anaerobic outcomes: for Both pathways, give the word equation and the application or consequence.
Reveal answer
Word equation: Glucose is incompletely broken down. Application or consequence: Lower ATP yield than aerobic respiration.
Key words: Both pathways
True or false, and why? “Human anaerobic respiration produces ethanol.”
Reveal answer
False. Animal muscle forms lactate; plants and yeast form ethanol and carbon dioxide.
True or false, and why? “Muscle anaerobic respiration releases carbon dioxide.”
Reveal answer
False. Carbon dioxide is not a product of the specified lactate pathway.
True or false, and why? “Lactic acid remains for days and causes soreness.”
Reveal answer
False. Lactate is processed much sooner; delayed soreness has other causes.
True or false, and why? “Fermentation produces ATP because ethanol is burned by yeast.”
Reveal answer
False. ATP is generated during glycolysis; ethanol formation enables that pathway to continue.