When making bread, you first "proof" the yeast by mixing it with sugar in lukewarm water. Assuming that the yeast are alive, what happens next and why?
A) The water will become cloudy as the flagellated yeast cells swim around.
B) The yeast will germinate and start to form a mycelium.
C) Bubbles form as the yeast ferment the sugar and release carbon dioxide.
D) Bubbles form as the yeast produce sugar and release oxygen.
E) Nothing could happen, since yeast are not living organisms.

Question

Quizplus · Accepted Answer

Yeast ferments the sugar present in the mixture, converting it into alcohol and carbon dioxide. The release of carbon dioxide gas is what causes the formation of bubbles, indicating that the yeast is active and the fermentation process is underway. This is a crucial step in bread making as it helps the dough rise.

When Making Bread, You First "Proof" the Yeast by Mixing