Which statement is true about sake fermentation?

Which statement is true about sake fermentation?

• A. It uses a mold called Koji to convert starch to sugars
• B. It uses top-fermenting yeast to produce alcohol
• C. It is produced without using rice
• D. It does not involve any fermentation step

Answer: (A)

Koji's enzyme action turning starch into fermentable sugars is what makes sake fermentation possible. In sake, koji mold grows on steamed rice and releases enzymes that break down the rice starches into simple sugars. Those sugars become the food for yeast, which converts them into alcohol. This parallel fermentation—where starch-to-sugar conversion and sugar-to-ethanol happen in the same mash—is how sake develops its character. So, using a mold named Koji to convert starch to sugars is the correct idea. The statement about top-fermenting yeast isn’t accurate for sake, because that description belongs to beer terminology and sake uses a specialized yeast suited to high-sugar, high-alcohol environments. The idea that sake is produced without using rice is false, since rice is the essential base. And saying there’s no fermentation step is also false because fermentation is the defining process that produces the alcohol in sake.

Koji's enzyme action turning starch into fermentable sugars is what makes sake fermentation possible. In sake, koji mold grows on steamed rice and releases enzymes that break down the rice starches into simple sugars. Those sugars become the food for yeast, which converts them into alcohol. This parallel fermentation—where starch-to-sugar conversion and sugar-to-ethanol happen in the same mash—is how sake develops its character. So, using a mold named Koji to convert starch to sugars is the correct idea.

The statement about top-fermenting yeast isn’t accurate for sake, because that description belongs to beer terminology and sake uses a specialized yeast suited to high-sugar, high-alcohol environments. The idea that sake is produced without using rice is false, since rice is the essential base. And saying there’s no fermentation step is also false because fermentation is the defining process that produces the alcohol in sake.