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Tung Nguyen Locker
8/5/19 12:54 PM
8/5/19 12:55 PM

Mr. Nguyen

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Student Activity

Science Lab: Macro-molecule Testing
Purpose: Students use indicators to test for the presence of lipids, carbohydrates, and proteins in various foods.
Introduction: One characteristic of life is that living things are made up of molecules containing carbon. These are called organic molecules. In our class we have been referring to them as macro-molecules since they are necessary for life. The most common organic compounds found in living organisms are LIPIDS, CARBOHYDRATES, PROTEINS, and NUCLEIC ACIDS. Common foods, which often consist of plant materials or substances derived from animals, are also combinations of these organic compounds. Simple chemical tests with substances called indicators can be conducted to determine the presence of organic compounds. A color change of an indicator is usually a positive test for the presence of an organic compound.
Materials: Indicators (Biuret reagent, Lugol’s solution/Iodine), gloves, brown paper towel, well plate, food bottles, pipettes.

1. Students collaborate and assign roles

2. Students transfer materials using pipettes

3. Students fill well plate with food samples

4. Students use indicators to test and collect data.

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