Macromolecule Lab

In class, we did a lab testing substances for four different macromolecules (Protein, glucose, starch and lipids). These substances included egg whites, egg yolks, potatoes, apples, onions, strawberries and lemons. My substance was onion, which tested positive for protein and glucose and negative for starch and lipids.

This nutrition fact proves what we found. It says that there are carbohydrates in onions. Also, it says that there is one gram of proteins in onions, which we also tested positive for. This nutrition fact also says that there is zero grams of fat in an onion, which we tested negative in. In this picture, it doesn't say anything about starch, even though onions don't have starch in it. This plant website explaining starch has an excerpt that says "Bulbs like garlic and onion store food in the form of sugar rather than starch."

Through this lab, we were able to find out what substances had what in them. This lab was extremely interesting because we could test things that we eat in our everyday lives.