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UMUC Biology 102/103
Lab 4: Enzymes
INSTRUCTIONS:
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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.,
Smith_Lab4).
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
explanation.
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
Substance
Resulting Color
Presence of Starch?
Is Amylase present?
Positive Control: Starch
Negative Control: _____
Student must select
Food Product: ______
Student must select
Food Product: ______
Student must select
Saliva
Take a picture of your results. Include a note with your name and date on an index card
in the picture. Insert picture here:
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?
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
Tube
Temperature (°C)
Balloon Circumference
(Uninflated; cm)
Balloon Circumference
(Inflated; cm)
1 – (Cold)
2 – (RT)
3 – (Hot)
Take a picture of your results. Include a note with your name and date on an index card
in the picture. Insert picture here:
Post-Lab Questions
1. What reaction is being catalyzed in this experiment?
2. What is the name of the enzyme in this experiment? What is the substrate?
3. What is the independent variable in this experiment? What is the dependent variable?
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4. How does the temperature affect enzyme function? Use evidence from your data to support
your answer.
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.
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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