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The Effect of low pH on Enzyme Activity

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This is the Final Applied Lab Project
Addresses course outcomes 1-5:
• apply the scientific method to scientific investigations
• state a scientific hypothesis and design a basic experiment
• conduct an experiment, make observations, and collect data
• use knowledge of biological principles to correctly interpret qualitative and quantitative information
• use critical analysis to draw conclusions

For this project, you will complete the activity below. Make sure to address all points (questions) associated with the activity.
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 review the Scientific Method Tutorial to better understand how to design an experiment. It may also be helpful for you to review (Enzymes). Please be sure you understand everything, you will be reminded that there are several factors that impact enzymatic activity: pH, temperature, and amount of reagent. Or in other words, it is OK to use the same enzyme/subtrate/method as you did in lab 4 (but modify the treatment), or you can search on-line to find a different enzyme/subtrate/method for measuring enzyme activity.
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 and the acid, as well as explain your experimental protocol (this information will help you to answer question 2). You must also thoroughly explain how the addition of the acidic fluid impacted the overall reaction process (this information will help you to answer question 4).
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.
Lab Materials
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
• vinegar
• yeast (can be purchased at grocery store if you need more)
• balloons
• plastic bottle
• marker for labeling of beakers
You may choose to use additional materials (different acidic solutions and/or different organisms and/or differnet subtrate(s) if you chose to look at an enzyme other than catalase).
Outline submit in assignment folder in week 7.
I suggest you include the following in your outline:
• Name of enzyme you will use, and source (organism) Bromelain
• The substrate (Gelatin)
• How you will measure enzyme activity (method)
• What type of treatment you will you; type of solution(s), pH, length of exposure, how you will treat your samples
• The control(s) in the experiment
• Sample size
• Maybe how you plan to 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 paper that includes the following:
1. Title page: title, your name, course name, semester
2. Introduction: introduce your project, include needed background information, the question(s) that you are asking and a clear hypothesis for your experiment.

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