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Exercise 8: Chemical and Physical Processes of Digestion: Activity 2: Exploring Amylase Substrate Specificity Lab Report
Pre-lab Quiz Results
You scored 100% by answering 5 out of 5 questions correctly.
1. Which of the following is true of enzymes and substrates?
You correctly answered: c. Enzymes are specific about the substrates they can act upon.
2. Which of the following is/are reducing sugars?
You correctly answered: e. both glucose and maltose
3. Cellulose and starch are both
You correctly answered: e. polymers of glucose and polysaccharides.
4. Proteins and peptides are formed by joining amino acids with a special type of covalent bond called a peptide bond.
Which of the following enzymes do you think would be specific for a peptide bond?
You correctly answered: c. peptidase
5. The Benedict's assay tests for the presence of
You correctly answered: c. reducing sugar.

Post-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly.
1. The substrate(s) for amylase is/are
You correctly answered: a. starch.
2. The results of tube 5 demonstrated that
You correctly answered: b. peptidase does not digest starch.
3. Why was the cellulose in tube 6 hydrolyzed to glucose?
You correctly answered: d. The bacterial suspension contained the enzyme cellulase, which digested the cellulose.
4. Can you detect the presence of contaminating amylase from your experiments?
You correctly answered: c. It is not possible to determine whether contaminating amylase is present because amylase
doesn't digest cellulose.

thx a lot