This week, it was time to apply what we learned about biomolecules last week. We received a call for some detective help to analyze evidence left at the scene of a theft and the kids had to figure out who's lunch matched the food particles that were left by the thief. The groups discussed the information they had and worked on coming up with a plan that would let them narrow down the suspects. They ran the 4 tests we'd done last week on a sample of each person's lunch and then we determined which biomolecules were present in the foods as a class. After that, it was time to test the evidence samples. They ran the same tests on the unknown substance and we were able to make a match! It turned out that Bruce had left behind a little of his sunbutter and jelly sandwich when he stole Jerrel's iPod. This lab was a good opportunity for the students to practice setting up their own experiment and to see an application for the science in real life. Activities Have your child test for biomolecules in their foods one day. Glucose strips and iodine (to test for protein) are easy to find at a drugstore and biuret reagent (to test for starch) is available on Amazon. Fats can be found using a brown paper bag. General instructions for using these indicators can be found here. Review what types of foods have carbohydrates, fats, and protein and then have them make predictions before they test. See if their meal is a balance of all three.
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May 2020
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