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The breakdown of sugar by yeast enzymes, producing ethanol and carbon dioxide.

The breakdown of sugar by yeast without oxygen, producing ethanol and carbon dioxide.

Ethanol can be made by fermentation. Yeast is added to an aqueous sugar solution and kept warm, around 30 °C, without oxygen. Yeast enzymes break down the sugar, producing ethanol and carbon dioxide.

When yeast acts on a sugar such as glucose, its enzymes catalyse fermentation.

A biological process in which microorganisms convert carbohydrates into other substances; yeast converts sugars into ethanol and carbon dioxide without oxygen.

The anaerobic conversion of a carbohydrate into ethanol and carbon dioxide by enzymes in yeast.

Fermentation produces ethanol in water, not pure ethanol. State that yeast needs warm conditions and no oxygen.

Link alcoholic drinks to fermentation: yeast enzymes catalyse the conversion of sugars into ethanol and carbon dioxide.

Fermentation produces ethanol in an aqueous mixture, not pure ethanol. Separating or concentrating it is a later step.