Activity 2 Testing foods for organic macromolecules.
Before continuing with the online activity, make 4 predictions.
The foods you will test are: potatoes, orange juice, almonds, eggs, salmon, and milk.
Make a prediction which foods will test positive for fats,
and tell what you will see.
Make a prediction which foods will test positive for proteins, and the
color you expect to see.
Make a prediction which foods will test positive for starch, and the
color you expect to see.
Make a prediction which foods will test positive for simple sugars, e.g. glucose,
and the color you expect to see.
Record color observed for each food tested.
Record the data in this Table.
FOOD | Benedicts test | Iodine test | Biuret test | Sudan IV test
potatoes | | | |
orange juice | | | |
almonds | | | |
eggs | | | |
salmon | | | |
milk | | | |
Draw a conclusion for each prediction made.
Summarize your results then compare your predictions to the data, and accept or reject your hypothesis.
Write a conclusion for each test.
If your results match the prediction you made for foods that will test positive for that molecule, accept your hypothesis.
If your results match the prediction you made the foods that will test positive for that molecule reject your hypothesis.
Write a conclusion for the test for simple sugars.
Write a conclusion for the test for starch.
Write a conclusion for the test for protein.
Write a conclusion for the test for fats.
Suggest one more food you would like to test and suggest which tests will show positive using the same four tests.