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Expression of IdeasMediumExplaining a cause

Expression of Ideas practice question

While researching a topic, a student has taken the following notes: - Bread crusts turn brown in the oven. - The browning is the Maillard reaction between sugars and proteins in the dough. - The reaction needs temperatures above about 140°C. - The inside of a loaf stays below 100°C while it contains water, so it does not brown.

The student wants to explain why a loaf's crust browns but its inside does not. Which choice most effectively uses relevant information from the notes to accomplish this goal?

  1. A. Browning comes from a reaction between sugars and proteins that needs about 140°C; the crust reaches that, but the wet interior stays below 100°C and cannot brown.Correct
  2. B. Bread crusts turn brown in the oven.
  3. C. The inside of a loaf contains water.
  4. D. Ovens are hot.

Answer: A. Browning comes from a reaction between sugars and proteins that needs about 140°C; the crust reaches that, but the wet interior stays below 100°C and cannot brown.

The reaction, its temperature, and why only the crust gets there.

Why the other answers are wrong

B. Bread crusts turn brown in the oven.
Restates the observation.
C. The inside of a loaf contains water.
One fact without the link to browning.
D. Ovens are hot.
A generality.

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