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

question 6

Multiple Choice

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.

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