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UMUC Biology 102/103
Lab 4: Enzymes

On your own and without assistance, complete this Lab 4 Answer Sheet
electronically and submit it via the Assignments Folder by the date listed in the Course
Schedule (under Syllabus).


To conduct your laboratory exercises, use the Laboratory Manual located under
Course Content. Read the introduction and the directions for each exercise/experiment
carefully before completing the exercises/experiments and answering the questions.


Save your Lab 4 Answer Sheet in the following format: LastName_Lab4 (e.g.,


You should submit your document as a Word (.doc or .docx) or Rich Text Format
(.rtf) file for best compatibility.

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Pre-Lab Questions
1. How could you test to see if an enzyme was completely saturated during an experiment?

2. List three conditions that would alter the activity of an enzyme. Be specific with your

3. Take a look around your house and identify household products that work by means of an
enzyme. Name the products, and indicate how you know they work with an enzyme.

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Experiment 1: Enzymes In Food
Data Tables and Post-Lab Assessment
Table 1: Substance vs. Starch Presence

Resulting Color

Presence of Starch?

Positive Control: Starch
Negative Control: Student Must
Food Product:
Food Product:

Post-Lab Questions
1. What were your controls for this experiment? What did they demonstrate? Why was

saliva included in this experiment?

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2. What is the function of amylase? What does amylase do to starch?

3. Which of the foods that you tested contained amylase? Which did not? What

experimental evidence supports your claim?

4. Saliva does not contain amylase until babies are two months old. How could this affect

an infant’s digestive requirements?

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5. There is another digestive enzyme (other than salivary amylase) that is secreted by the

salivary glands. Research to determine what this enzyme is called. What substrate does it
act on? Where in the body does it become activated, and why?

6. Digestive enzymes in the gut include proteases, which digest proteins. Why don’t these

enzymes digest the stomach and small intestine, which are partially composed of protein?

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Experiment 2: Effect of Temperature on Enzyme Activity
Data Tables and Post-Lab Assessment
Table 2: Balloon Circumference vs. Temperature

Temperature (°C)

Balloon Circumference
(Uninflated; cm)

Balloon Circumference
(Inflated; cm)

1 - (Cold)
2 - (RT)
3 - (Hot)

Post-Lab Questions
1. What reaction is being catalyzed in this experiment?

2. What is the enzyme in this experiment? What is the substrate?

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3. What is the independent variable in this experiment? What is the dependent variable?

4. How does the temperature affect enzyme function? Use evidence from your data to support

your answer.

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5. Draw a graph of balloon diameter vs. temperature. What is the correlation?

6. Is there a negative control in this experiment? If yes, identify the control. If no, suggest how

you could revise the experiment to include a negative control.

7. In general, how would an increase in substrate alter enzyme activity? Draw a graph to

illustrate this relationship.
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8. Design an experiment to determine the optimal temperature for enzyme function, complete

with controls. Where would you find the enzymes for this experiment? What substrate would
you use?

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