Final Applied Lab Project (1 credit Lab Component)
Addresses course outcomes 1-4:
- recognize and explain how the scientific method is used to solve problems
- make observations and discriminate between scientific and pseudoscientific explanations
- weigh evidence and make decisions based on strengths and limitations of scientific knowledge and the scientific method
- use knowledge of biological principles, the scientific method, and
appropriate technologies to ask relevant questions, develop hypotheses,
design and conduct experiments, interpret results, and draw conclusions
This is the culminating lab assessment in BIOL 103. It is designed to
assess your ability to apply the principles of the scientific method.
The Effect of low pH on Enzyme Activity
Design an experiment in which you will test the effect of an acidic
fluid on enzymatic activity. Recall: enzymes are proteins! To complete
this project, it may be useful for you to first review the Scientific
Method Tutorial, information about pH and enzymes in the text book and
course modules, Lab 1 (Introduction to Science) and Lab 4 (Enzymes). As
you review Lab 4, you will be reminded that there are several factors
that impact enzymatic activity: pH, temperature, and amount of
reagent. It is OK to use the same enzyme/substrate/method as you did in
lab 4 (but modify the treatment), or you can search on-line to find a
different enzyme/substrate/method for measuring enzyme activity for your
project (include all references).
As you design your experiment for this project, please remember that you are trying to examine how an acidic fluid
will modify the outcome of an enzymatic reaction. To successfully
complete this project, you will need to identify the question(s) being
asked in your experiment and the hypothesis that you are testing. In
your experimental design, you must clearly explain what you are doing.
That means that you will need to identify the enzyme, the substrate, the
acidic fluid used as treatment, the control treatment and the method of
measuring enzyme activity, as well as explain your experimental
protocol. You must also thoroughly explain how the acidic fluid
impacted enzyme activity based on the results from your own experiment
as well as knowledge of enzymes and pH from the text book, modules, lab
manual and potentially additional information sources.
Hint: Keep in mind that the acid will change the
environmental conditions of the experiment (for example, a low pH value
could change the shape of the active site on the enzyme protein),
without directly participating in the reaction.
You may need all or some of the following, depending on your experimental design:
Materials from your lab kit:
- pH paper
- hydrogen peroxide solution (you can purchase this at a pharmacy if you have used up the bottle that came with the lab kit)
- plastic beakers or cups
- yeast (can be purchased at grocery store if more is needed)
- plastic bottle
- marker for labeling of beakers
- Cell phone/digital camera - pictures required
You may choose to use additional materials (different acidic fluids
and/or different organisms and/or different substrate if you chose an
enzyme other than catalase).
Include the following in your outline:
- Name of enzyme you will use
- Name of organism (if applicable)
- The substrate and products in the chemical reaction
- Method for measuring enzyme activity
- Treatment: acidic fluid(s), pH, length of exposure, how you will treat your samples
- The control(s) in the experiment
- How you will present your data (table and/or type of graph)
- Anything else you would like to get feedback on before you start your experiment
Write a lab report that includes the following:
1. Title page: descriptive title, your name, course name, semester
2. Introduction: general background information about enzymes and
specific information about your chosen enzyme, the question(s) that you
are asking and a clear hypothesis for your experiment (20 points).
3. Design an experiment. Provide a detailed description of the
materials and methods used to conduct the experiment. Identify control
and experimental samples, as well as independent and dependent
variables. Also include the methods used for data collection and
analysis (20 points).
4. Conduct the experiment and record your results. Take picture(s) of
your results. What did you observe? Present your data in table and/or
graph format. Remember to label everything and include the unit of
measure with all numbers (20 points)
5. Use your knowledge of enzymes and pH to interpret and discuss your
results. It may be necessary for you to refer to the OLI course
modules, lab manual and/or use additional information resources. What
effect does the acidic treatment have on enzyme activity? Did you get
the expected results? Explain. (20 points)
6. State a specific and accurate conclusion. Is your hypothesis
supported by the results? Looking back, how could you have improved your
experiment? (10 points)
7. Include a list of references to all information sources used in APA format (5 points).
It is very important to write with your own words.
If you do copy one or two sentences directly (use sparingly), use
quotation marks (") around the copied text, followed by an in-text
reference. All information sources need to be included in the reference
list and as in-text references. Plagiarism will be reported to the
proper UMUC authority. Guidance on how to avoid plagiarism can be found
Submit your final applied lab project in the assignment folder by the due date specified in the course schedule.