In the amylase activity experiment, the development of a blue-black color upon the addition of iodine-potassium-iodide to the test tube indicates that
A. amylase is functioning at its optimum temperature.
B. glucose is present in the test tube.
C. the starch has not been broken down.
D. the starch has been denatured.
E. the starch has been broken down.
Answer: C
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