the patient: figaro. what type of macromolecule is an antibody? what shape is a typical antibody?...
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The Patient: Figaro
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• What type of macromolecule is an antibody?
• What shape is a typical antibody?
Protein
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• What is an antigen?
• How many antigens can the antibody below bind to?
Foreign Molecule
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Figaro Activity Possible Antigens
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Brain storm ways to test for possible allergies.
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• Label 3 Petri Plates with initials, date, period, LB Agar, and TRIAL 1, 2 or 3 (depending on the plate).
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• Cut the bottom off a large transfer pipet.
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• Apply a slight suction by compressing the bulb of the pipet between your fingers.
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• Use the transfer pipet to poke holes in the agar.
• Make 4 holes around the edge of the agar.
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• Make 1 hole in the center of the agar.
1
2
3
4
C
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• In your notebook, draw a Petri plate and label which antigen goes into each outside hole.
Allergen 1: ?
Allergen 3: ?
Allergen 2: ?
Allergen 4: ?
1
23
4
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• On your Petri plate drawing in your notebook, label the center hole as Figaro’s Blood Serum.
Figaro’s Blood Serum: Antibodies
C
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• Use a sterile 1 mL pipet to add antigen/ antibody solution to each hole in the agar.
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• Add enough antigen serum so the solution is at the top of the agar hole.
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• Use a different sterile 1 mL pipet for each antigen solution.
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• Fill the center hole with Figaro’s Blood Serum (antibody solution).
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• Repeat these steps for all 3 trials/ Petri plates.
• Cover all 3 Petri plates and leave undisturbed for 24 hours.
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• Collect Petri plates.• Draw Petri plate results in
your notebook.• Write down observations• Form a data table in Excel.• Create numeric scale to
convert observations to data.
• Collect data from each trial.• Average the data from trials.
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• A precipitin line will appear between one or more of the allergens and the blood serum.
Precipitin Lines
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• Record results of each of the 3 trials using a numeric scale– 5 = strong precipitation; 0 = no precipitation
• Calculate average results for each antigen
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• The brighter precipitin lines, the stronger the allergy.
Weak Allergy Strong Allergy
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• This lab is an example of an Ouchterlony test.
• When antibodies diffuse in agar and bind with antigens, it causes agglutination, or a white precipitin line.
Agglutination = Precipitin Lines
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• Make an individual data table in Google documents.
• On the Smart Board, add your group’s data to the table and make a class average data table on your Google spreadsheet below your individual data table.
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• Post your individual data table, class average data table, and your REE PE PA three-paragraph conclusion on a new page for this lab on your Google Site.
• Results - Go back to the purposes of the lab.• Evidence - Numerical evidence.• Explanation - Go back to your hypothesis.• Possible Errors
– 2 examples of errors– Avoid future errors
• Practical Applications– Suggestions to patient/family.– Further testing– Value of this lab/test