Explain the role of yeast in the fermentation process of sugar.

Yeast acts as a microorganism that ferments sugar, converting it into ethanol and carbon dioxide. The yeast metabolizes the sugar anaerobically, producing alcohol as a byproduct.

This question evaluates the understanding of the biological role of yeast in fermentation, linking the process to the production of alcohol. It requires an explanation of the metabolic activity of yeast, demonstrating comprehension of fermentation. This response is aligned to Alcohols because it explains know the conditions used for fermentation of sugar using yeast using the correct AQA GCSE Chemistry organic context. Keep molecular formula, structural formula, displayed formula, and general formula distinct. Do not confuse alkanes with alkenes, saturated with unsaturated, cracking with combustion, polymers with monomers, or hydrocarbons with oxygen-containing alcohols and carboxylic acids. When formulae are used, preserve the stored notation exactly and explain the GCSE chemistry idea in words rather than using unsupported displayed-formula diagrams.