During fermentation by yeast, sugar is turned into which substance?

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Multiple Choice

During fermentation by yeast, sugar is turned into which substance?

Explanation:
Yeast ferments sugar in the absence of oxygen, breaking it down to produce ethanol and carbon dioxide. The substance asked for is ethanol, which is the alcohol formed during this process. Carbon dioxide is also produced and usually escapes—the CO2 is what makes bread dough rise and carbonates drinks. Glucose is the starting sugar, not the product; lactic acid comes from a different fermentation carried out by bacteria or muscle cells, and oxygen isn’t involved in fermentation.

Yeast ferments sugar in the absence of oxygen, breaking it down to produce ethanol and carbon dioxide. The substance asked for is ethanol, which is the alcohol formed during this process. Carbon dioxide is also produced and usually escapes—the CO2 is what makes bread dough rise and carbonates drinks. Glucose is the starting sugar, not the product; lactic acid comes from a different fermentation carried out by bacteria or muscle cells, and oxygen isn’t involved in fermentation.

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