What is anaerobic respiration? What happens during anaerobic respiration in yeast? [3 Marks]

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Solution

Anaerobic respiration is a type of respiration that occurs in absence or lack of $O_{2}$ . The end products are mostly lactic acid or alcohol. It involves production of less energy, i.e., only 2 ATP.
$C_{6} H_{12} O_{6}$ → Lactic acid /alcohol + energy
[1 Mark]

In anaerobic respiration of yeast, pyruvate is converted to ethanol.
Here, pyruvate is decarboxylated to ethanol.
[1 Mark]
$C_{6} H_{12} O_{6} \to 2 C_{2} H_{5} O H + 2 C O_{2}$ + Energy
Glucose --> Ethanol + Carbon dioxide + Energy
[1 Mark]

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