Lab: Identifying Nutrients
Explore the presence of nutrients in food using a laboratory experiment and deductive reasoning.
Approximately 45 minutes
Your biology teacher found an unknown food sample in the classroom, and there are four suspects: students who have different foods for lunch.
For various reasons, your teacher strongly suspects Zack of leaving the food sample. In this lab, you will figure out who was guilty by determining which macromolecules are present in the mystery food sample.
Which macromolecules are present in the mystery food sample?
If the mystery food is tofu, then it will react with the reagent that indicates the presence of a protein because tofu is primarily protein.
Independent variable: presence of macromolecules, including monosaccharides, polysaccharides, proteins, and lipids
Dependent variable: color changes observed in tests
Always wear safety goggles and a lab coat when performing an experiment. Keep behavior in the lab purposeful.
Use caution when working with dyes. They may stain your clothes or body. Check glassware such as test tubes and beakers for cracks and chips prior to use. Use the right gear, such as insulated gloves and test tube tongs, when moving test tubes into and out of the boiling water bath. When handling test samples otherwise, use thinner protective gloves of latex or other suitable material.
Report all accidents—no matter how big or small—to your teacher. Never eat food in a science laboratory. Contamination could cause illness.
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Student Guide (continued)
Step 1: Gather Materials
Mystery Food Sample
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