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Expression of IdeasMediumExplaining why bread rises

Expression of Ideas practice question

While researching a topic, a student has taken the following notes: - Yeast in bread dough feeds on the dough's sugars. - As it feeds, the yeast gives off carbon dioxide gas. - Gluten, a protein in the dough, traps the gas as bubbles. - In the oven's heat the bubbles expand.

The student wants to explain why bread rises. Which choice most effectively uses relevant information from the notes to accomplish this goal?

  1. A. Yeast feeding on the dough's sugars gives off carbon dioxide, which the dough's gluten traps as bubbles that expand in the oven's heat.Correct
  2. B. Bread rises in the oven.
  3. C. Gluten is a protein found in dough.
  4. D. Bread rises because the oven's heat melts the yeast.

Answer: A. Yeast feeding on the dough's sugars gives off carbon dioxide, which the dough's gluten traps as bubbles that expand in the oven's heat.

The whole chain from yeast to expanding bubbles — choice A explains the rise.

Why the other answers are wrong

B. Bread rises in the oven.
This states that bread rises, not why.
C. Gluten is a protein found in dough.
A definition, not an explanation.
D. Bread rises because the oven's heat melts the yeast.
The notes say nothing about yeast melting.

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