Discussion
The sugars in grape juice that yeast ferments are chiefly
Answer: A
Correct answer: Glucose and fructose
Ripe grapes contain roughly equal amounts of glucose and fructose, together making up most of the must’s soluble solids, and Saccharomyces ferments both. This is why wine needs no mashing stage: the sugar is already present and fermentable, whereas barley must have its starch converted first.
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