What is added to the grape juice to start fermentation?

What is added to the grape juice to start fermentation?

• A. Yeast
• B. Sugar
• C. Bacteria
• D. Water

Answer: (A)

Yeast is added to grape juice to start fermentation. Yeast consumes the sugars in the juice and converts them into alcohol and carbon dioxide, kicking off the alcoholic fermentation. While grape juice already contains sugars and there may be wild yeasts on the grapes, adding a yeast culture ensures a reliable, controlled start. Sugar by itself won’t begin fermentation without yeast, and water would just dilute the juice. Bacteria can influence other stages of winemaking, but they’re not used to initiate the primary alcoholic fermentation.

Yeast is added to grape juice to start fermentation. Yeast consumes the sugars in the juice and converts them into alcohol and carbon dioxide, kicking off the alcoholic fermentation. While grape juice already contains sugars and there may be wild yeasts on the grapes, adding a yeast culture ensures a reliable, controlled start. Sugar by itself won’t begin fermentation without yeast, and water would just dilute the juice. Bacteria can influence other stages of winemaking, but they’re not used to initiate the primary alcoholic fermentation.