Purpose Time
Scenario
Explore the presence of nutrients in food using a laboratory experiment and deductive
reasoning
Approximately 45 minutes
Your blology teacher found an unknown food sample in the classroom, and there are
four suspects: students who have different foods for lunch.
Student
Macromolecule Present
Zack
Tofu
Protein
Nicole
Salad dressing
Lipid
Christian
Jelly sandwich
Monosaccharides
Abigail
Pasta
Polysaccharides
Food
Question
Hypothesis
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
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Variables
here
Safetz
what is the independent variable