Exercise 8: Chemical and Physical Processes of Digestion: Activity 1: Assessing Starch Digestion by Salivary Amylase Lab
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Pre-lab Quiz Results
You scored 100% by answering 6 out of 6 questions correctly.
1. The substrate for amylase is
You correctly answered: e. starch and carbohydrate.
2. Which of the following is true of enzymes?
You correctly answered: c. Their activity can be affected by temperature and pH.
3. The reagent IKI tests for the presence of
You correctly answered: a. starch.
4. Which of the following is not true of controls?
You correctly answered: d. A negative result with a positive control is required to validate the test
5. Which of the following is an end product of starch digestion?
You correctly answered: e. maltose and glucose
6. Hydrolases are enzymes that break down large molecules into smaller subunits through the addition of _____________.
You correctly answered: b. water
Post-lab Quiz Results
1. Tubes 3, 7, and 8 reveal that
Correct answer: d. amylase activity was highest at pH 7.
2. This activity includes a number of negative controls. Which tube indicates that the amylase solution was not
contaminated with maltose?
Correct answer: b. tube 4
3. Which tubes indicate that the deionized water did not contain contaminating starch or maltose?
Correct answer: c. tubes 4, 5, and 6
4. Explain where and why salivary amylase would be most active.
Correct answer: d. Salivary amylase would be most active in the mouth because pH 7 is where its peak activity is.
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